How to set up Instantly for cold email 2026: the definitive guide to every setting new users miss

Last updated: June 2026 · Ryan Mercer, SDR turned cold email consultant, 8 years outbound

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TL;DR — 5 things to know before reading

• Instantly setup takes 2–3 hours of active configuration, but the warmup phase requires 2–4 weeks before any cold outreach should launch; teams that skip warmup consistently see open rates below 15% regardless of list quality
• The most commonly missed settings are: random send delay (prevents automation pattern detection), per-inbox daily sending limits (should be 30–50, not the platform default), stop-on-reply (must be enabled or prospects receive follow-ups after responding), and custom tracking domain (prevents shared tracking domain reputation bleed)
• Never send cold email from your primary business domain; use Inframail to provision dedicated Microsoft 365 inboxes on separate domains with SPF, DKIM, and DMARC configured automatically
• Per Instantly's cold email benchmark report, average cold email reply rate is 3.43% across all senders; elite senders (top 10%) achieve above 10% — the difference is almost entirely infrastructure and list quality, not copy
• Verdict: Instantly is the sending and sequence layer; Inframail is the dedicated inbox infrastructure; Quarvio provides verified contacts with bounce rates under 1%; Aimfox runs the LinkedIn channel in parallel

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Our take

Instantly is one of the most well-designed cold email platforms available, but it is not self-configuring. The settings that determine whether your campaigns land in inbox or spam are not the ones Instantly highlights during onboarding — they are the ones buried three menus deep that most new users never find. After eight years in outbound and hundreds of Instantly setup sessions with clients, the failure pattern is remarkably consistent: practitioners use default settings, skip or rush warmup, import contact lists without verifying quality, and then conclude that cold email does not work. The platform is not the problem.

This guide covers every step in the correct sequence, with every significant configuration decision explained alongside the recommended value and the failure mode when you get it wrong. It is a complete reference document, not an abbreviated tutorial. If you follow this guide in full, your Instantly setup will be production-grade from day one. If you have already set up Instantly and are troubleshooting poor performance, the troubleshooting section and the configuration reference table will help you diagnose what was misconfigured.

The full stack this guide is built around: Inframail for inbox provisioning, Instantly for sending and sequence management, Quarvio for verified B2B contact data, and Aimfox for the LinkedIn channel running in parallel. Each tool handles one layer of the outbound system; this guide focuses on the Instantly configuration layer in full.

What you need before you start

Before logging into Instantly for the first time, complete these prerequisites. Skipping them and trying to do infrastructure setup after the fact creates re-work and delays.

Domain infrastructure (complete before Instantly setup):

• Purchase one or more dedicated cold email domains (never use your primary business domain)
• Set up these domains in Inframail — Inframail provisions Microsoft 365 inboxes with SPF, DKIM, and DMARC configured automatically
• Verify that all inboxes show active status in Inframail and that DNS records are confirmed

Contact list (complete before importing):

• Obtain a verified B2B contact list from Quarvio in CSV format
• Confirm the CSV includes: email address, first name, last name, company name, job title
• Do not import unverified or scraped contact lists — bounce rates above 3% damage sender reputation permanently

Sending account inventory:

• Know how many inboxes you have provisioned in Inframail
• Confirm the credentials (email address + password) for each inbox
• Plan your target daily send volume so you know how many inboxes you need (30–50 per inbox per day)

Planning your ICP and sequence:

• Define the ICP (ideal customer profile) for the initial campaign
• Draft the subject line and body for each sequence step before opening Instantly — having copy ready reduces the time to activate

Step 1: Create your Instantly account

1a: Account registration

Navigate to Instantly and create an account using your primary business email. Use your real business name — this is your workspace name and appears on internal Instantly screens only.

Benchmark: Account creation and email verification takes under 5 minutes.

Failure mode: Using a personal Gmail address for account registration creates confusion when multiple team members need access. Use a company email (yourname@yourcompany.com) for the Instantly workspace owner.

1b: Plan selection

Instantly offers three primary plans. Select based on your sending account requirements, not your contact volume:

Important: “Sending accounts” means the number of email inboxes you can connect, not team members. If you have 10 Inframail inboxes to connect, you need at least Hypergrowth.

Benchmark: Most practitioners running their first Instantly campaign start on Growth (3–5 inboxes) and upgrade to Hypergrowth within 60 days.

Failure mode: Selecting Growth when you need to connect more than 5 inboxes forces a mid-setup upgrade. Select the correct tier before connecting inboxes to avoid disruption.

1c: Workspace timezone configuration

The first setting most users skip: configure your workspace timezone under Settings → General.

Set this to the timezone of your target audience, not your own timezone. If you are sending to UK prospects from an India-based team, set workspace timezone to GMT. This affects all default sending schedule templates throughout the platform.

Benchmark: Timezone mismatch is the most common reason campaigns send at off-hours without the operator realising it.

Step 2: Set up dedicated sending infrastructure with Inframail

This step must be completed before connecting any inboxes to Instantly. Do not skip this even if you already have Google Workspace inboxes.

2a: Why dedicated domains are non-negotiable

Cold email must never be sent from your primary business domain. When a cold outreach campaign generates spam complaints (which it will, regardless of quality — even 0.1% of uninterested recipients mark as spam), those complaints affect the sending domain's reputation with major inbox providers. If the sending domain is your primary business domain, the complaints affect all company email: prospect follow-ups, customer communications, and internal messages.

Dedicated cold email domains on Inframail isolate cold email reputation from your primary business. If a cold email domain gets suppressed or blacklisted, you retire the domain and provision a new one. The business email is unaffected.

2b: Inframail provisioning

1. Navigate to Inframail and create an account
2. Select the number of inboxes you need (start with 3–5 for an initial campaign; scale up as warmup progresses)
3. Inframail provisions Microsoft 365 inboxes on dedicated domains with SPF, DKIM, and DMARC records configured automatically — no manual DNS work required
4. Download the inbox credentials file (email address + password for each inbox)
5. Verify each inbox shows “Active” status in the Inframail dashboard before proceeding

Why Microsoft 365 inboxes specifically: Microsoft 365 inboxes have high baseline deliverability because major enterprise companies use the same infrastructure. This gives new inboxes a deliverability advantage over custom SMTP configurations from the start.

Benchmark: Inframail provisioning takes 24–48 hours after order. Plan for this delay in your setup timeline.

Failure mode: Attempting to manually configure SPF, DKIM, and DMARC on custom domains is the second most common source of deliverability problems for new cold email setups. Inframail removes this failure mode entirely. Per Mailgun's email authentication guide, a missing or misconfigured DMARC record alone reduces inbox placement significantly.

2c: DNS verification

Even with Inframail's automatic configuration, verify DNS records before proceeding:

1. Log into your Inframail dashboard and confirm all three DNS records (SPF, DKIM, DMARC) show a green/verified status for each domain
2. If any record shows unverified: wait 24 hours for DNS propagation and recheck
3. If a record remains unverified after 24 hours: contact Inframail support before connecting inboxes to Instantly

Benchmark: DNS propagation completes within 24 hours for 95% of domains. DMARC records occasionally take up to 48 hours.

Step 3: Connect Inframail inboxes to Instantly

With infrastructure verified, connect each inbox to Instantly.

3a: Individual inbox connection

1. In Instantly, navigate to Email Accounts → Add Account
2. Select Microsoft 365 / Outlook as the account type (not SMTP — using native Microsoft 365 connection produces better deliverability)
3. Enter the inbox credentials: email address and password
4. Complete any OAuth authorisation steps if prompted
5. Confirm the inbox appears in your Email Accounts list with a green “Connected” status
6. Repeat for each Inframail inbox

Benchmark: Each inbox connection takes 2–3 minutes. 5 inboxes: approximately 15 minutes total.

3b: Bulk inbox connection

For teams connecting 10+ inboxes simultaneously, use Instantly's bulk import feature:

1. Navigate to Email Accounts → Import / Bulk Connect
2. Prepare a CSV file with columns: email, password, first name, last name (for signature)
3. Upload the CSV and confirm the connection batch
4. Monitor the batch connection status — some inboxes may require individual attention if credentials fail

Failure mode: Bulk import failures are usually caused by special characters in passwords. If batch import fails, connect inboxes individually.

3c: Post-connection verification

After connecting all inboxes, verify each one is fully functional:

1. Send a test email from each connected inbox to an external address you control (not your own Instantly account)
2. Confirm the test email arrives in the recipient's inbox (not spam)
3. Reply to the test email and confirm Instantly shows the reply in the Unibox

Benchmark: All connected inboxes should send and receive test emails successfully. An inbox that cannot send or receive in testing will not perform in campaigns.

Failure mode: If a connected inbox passes connection but fails test send, the issue is usually OAuth permission scope. Disconnect and reconnect with full permissions.

Step 4: Configure per-inbox email account settings

This is the section most new users skip entirely, using Instantly's defaults throughout. The defaults are not optimised for cold email deliverability. Configure each setting explicitly.

4a: Daily sending limits

In Instantly, navigate to each email account → Settings → Sending.

Per Woodpecker's guide on daily sending limits, 30–50 emails per inbox per day is the established safe range for properly warmed accounts. Exceeding this on a standard inbox risks triggering volume anomaly filters at receiving email providers.

Failure mode: Using Instantly's default daily limit, which may be higher than 50, on a new or recently warmed inbox is the primary cause of sudden deliverability drops in first campaigns.

4b: Sending schedule

In each email account, configure the sending schedule to match your target audience's business hours:

Important: Set this at the email account level, not the campaign level only. Campaign-level schedule overrides account-level for that campaign, but having a correct account-level default prevents misconfigured campaigns from sending at wrong hours.

Benchmark: Emails sent between 8am–10am in the recipient's timezone consistently show higher open rates than mid-afternoon sends for B2B outreach. Configure start time to 8:00 AM.

Failure mode: Not setting a timezone on the email account schedule means Instantly applies the workspace timezone, which may differ from the target audience timezone. Verify timezone alignment at both account and campaign levels.

4c: Random send delays

Enable random send delays between each outgoing email. This is one of the most important settings new users miss.

Fixed-interval sending — exactly 60 seconds between every email — is detectable as automation by some email provider filters and by some spam analysis tools. Random delays between 90 and 300 seconds create a human-like sending pattern that passes automated checks.

4d: Email signature configuration

Configure a real professional email signature for each inbox. Email provider algorithms note whether emails have signatures consistent with legitimate business correspondence.

Recommended signature fields:

• First name + last name
• Job title
• Company name
• Phone number (optional but adds legitimacy)
• Physical address (optional but required for CAN-SPAM compliance in the US — include in footer even if not in signature)

Failure mode: Cold emails with no signature, or signatures that say “Sent from Instantly” (the tool's default placeholder), look like automated bulk email and are flagged accordingly.

4e: Tracking domain configuration

By default, Instantly uses a shared tracking domain for open and click tracking. Shared tracking domains are used by many Instantly customers, and if any of those customers have been sending spam, the shared tracking domain may have a poor reputation.

Configure a custom tracking domain for your campaign sends:

1. In Instantly, navigate to Settings → Tracking Domain
2. Add your own subdomain (e.g., trk.yourdomain.com)
3. Follow Instantly's DNS configuration instructions to add a CNAME record
4. Verify the tracking domain shows as active

Benchmark: Custom tracking domain setup takes 30 minutes plus DNS propagation time. It is worth the setup time for any campaign above 500 sends.

Failure mode: Skipping custom tracking domain configuration is a deliverability risk on higher-volume campaigns. All links in emails are rewritten to go through the tracking domain — if that domain is flagged, link-contained emails may be flagged as spam.

Step 5: Enable and configure warmup on all inboxes

Warmup is the most important step and the most commonly rushed. Each inbox must be warmed before any cold outreach campaign uses it.

5a: Enable warmup per inbox

1. In Instantly, navigate to Email Accounts → [Each Account] → Warmup
2. Toggle warmup to Enabled
3. Configure the warmup parameters (see reference table below)
4. Repeat for every connected inbox

5b: Warmup settings configuration

Sub-step: After enabling warmup on all inboxes, check back after 48 hours to confirm warmup emails are being sent and received. Navigate to each inbox's warmup tab and confirm the daily volume is incrementing.

5c: Warmup timeline

Per Woodpecker's email warmup guide, minimum warmup period is 2–4 weeks; 8–12 weeks produces the highest baseline deliverability for accounts that will run at higher volumes long-term.

Benchmark: An inbox warmed for 3 full weeks with consistent 35% reply rate in the warmup network should reach a score of 80–90.

Failure mode 1: Enabling warmup but not monitoring it. If an inbox stops receiving warmup replies, the score stalls or drops. Check the warmup dashboard weekly.

Failure mode 2: Interrupting warmup by pausing it. Pausing warmup for more than 3–4 consecutive days erodes some of the reputation signal built. Keep warmup enabled continuously.

Failure mode 3: Using the same inbox for both warmup and immediate cold campaigns before the warmup score reaches 80. Warmup and campaign sends can coexist, but only after the initial warmup period is complete.

5d: Do not skip warmup

The primary reason practitioners get poor deliverability from Instantly is launching campaigns on inboxes that have not completed warmup. Per Woodpecker's email warmup guide, an inbox with no sending history that suddenly sends 30 cold emails per day presents every risk signal email providers screen for. The result is spam folder placement regardless of message quality.

Step 6: Build your contact list from Quarvio

6a: Obtain verified contact data

Before importing to Instantly, your contact list must be verified at the email level. Unverified email addresses produce bounces; bounce rates above 3% on a single campaign damage the sending inbox's reputation with receiving email providers.

Quarvio delivers pre-verified B2B contacts with a 90% deliverability guarantee — if bounce rates exceed 10%, credits return within 7 days. Select contacts by job title, industry, company size, and geography. See full pricing at /pricing.

6b: CSV preparation

Quarvio delivers contacts in CSV format. Before importing to Instantly, check:

1. Required columns are present: email, first_name, last_name, company, title
2. No blank rows or header issues in the file
3. No obvious formatting errors (emails with spaces, malformed domains)
4. List is segmented to a single ICP — do not import a mixed ICP list into one campaign

6c: Contact import in Instantly

1. Navigate to Leads → Import
2. Select “Upload CSV”
3. Upload the Quarvio CSV file
4. Map CSV columns to Instantly's lead fields:
   • email → Email (required)
   • first_name → First Name
   • last_name → Last Name
   • company → Company
   • title → Job Title (or a custom variable)
5. Assign the leads to a list with a descriptive name (e.g. “Quarvio-VP-Sales-2026-06”)
6. Confirm the import count matches your expected number

Benchmark: CSV import processes within 5 minutes for lists up to 10,000 contacts.

Failure mode: Mapping CSV columns incorrectly means personalisation variables in your sequence steps will be blank or contain the wrong data. Always verify mapping before confirming import.

6d: Post-import verification

After import, spot-check 5–10 lead records in the Leads section:

1. Confirm first name, last name, company, and title are populated correctly
2. Confirm email addresses look syntactically correct
3. If any field is blank or misaligned: re-import with corrected column mapping

Step 7: Build your email sequence

7a: Create the campaign

1. Navigate to Campaigns → New Campaign
2. Name the campaign using a descriptive naming convention: [ICP]-[Angle]-[YYYYMM] (e.g., VP-Sales-PipelineChallenge-202606)
3. Select 2–3 warmed inboxes to rotate sends across
4. Select the contact list you imported in Step 6

7b: Campaign-level sending settings

Before writing sequence steps, configure campaign-level sending settings:

Failure mode: Not enabling “Stop sequence on reply” is the single most common sequence configuration error. Prospects who reply to step 1 continue receiving step 2 and step 3, generating negative sentiment and spam complaints.

7c: Write and configure sequence steps

Step 1 (Day 0):

• Subject: short, lowercase, specific reference to recipient's role or context (4–7 words)
• Body: 100–150 words. Opening line personalised with first name and company or role context. One insight or question relevant to their function. No product pitch in step 1. Ends with a single soft-CTA question.
• Delay: 0 days (sends on campaign activation or lead assignment)

Step 2 (Day 3):

• Subject: “Re: [Step 1 subject]” — reply in same thread
• Body: 80–120 words. New angle not covered in step 1. A relevant outcome, data point, or specific outcome for a similar ICP. Direct meeting request this time.
• Delay: 3 days from step 1

Step 3 (Day 7):

• Subject: “Re: [Step 1 subject]” — same thread
• Body: 50–80 words. Acknowledge this is the final email. Offer a resource, case study, or open door without pressure. “If the timing is off, no worries — happy to reconnect later” consistently generates replies from prospects who were interested but not ready.
• Delay: 4 days from step 2 (7 days total from step 1)

Benchmark: Per Instantly's cold email benchmark report, 3-step sequences over 7 days produce the highest aggregate reply rates for most B2B verticals. Steps beyond 3 produce diminishing returns: approximately 70% of all replies come from steps 1 and 2.

7d: Personalisation token setup

Instantly uses personalisation variables that pull from lead fields. In the sequence editor, personalisation tokens are inserted from the variable picker. The standard tokens from a Quarvio CSV:

• First name: inserts lead's first name
• Company: inserts company name
• Title: inserts job title (mapped as custom variable during CSV import)

Benchmark: Sequences with personalised opening lines in step 1 outperform generic openers. Per Woodpecker's cold email benchmark study, personalisation is among the most significant reply rate drivers in B2B cold email.

Failure mode: If personalisation tokens appear as literal text in sent emails (e.g., “Hi First Name”) rather than the lead's actual name, the variable mapping during import was incorrect. Fix mapping in the Leads section before activating the campaign.

Step 8: Test launch to a small segment

Before launching to your full contact list, run a test segment.

8a: Create a test segment

1. In Instantly, navigate to Leads and filter the imported list
2. Select 30–50 contacts from the list as a test segment
3. Assign them to a separate test campaign with identical settings to the main campaign
4. Activate the test campaign

8b: 7-day monitoring targets

Monitor these metrics for the 7-day test period:

Benchmark: A properly warmed inbox sending to verified contacts with a relevant message to the right ICP should achieve 30%+ open rate and 5%+ reply rate in the first week.

Failure mode: Scaling to the full list before verifying test segment metrics. Amplifying a campaign with poor test metrics multiplies the problems — damaged inbox reputation, wasted contact credits, and poor domain reputation that takes weeks to recover.

8c: Scale decision

• All metrics within target range: activate full campaign
• Open rate low but reply rate acceptable: deliverability issue, not message quality. Check warmup score, check blacklists with MXToolbox blacklist checker
• Open rate acceptable but reply rate low: message quality or audience mismatch. Rewrite sequence steps and retest before scaling
• Bounce rate above 5%: stop immediately. Contact Quarvio support to review the delivered list or re-request credits if the deliverability guarantee applies

Step 9: Full campaign launch and ongoing monitoring

9a: Activate the main campaign

Once test segment metrics are validated:

1. Confirm all sending inboxes show warmup scores above 80
2. Activate the main campaign
3. Set an initial daily cap below the maximum — ramp from 60% of maximum in week 1, reach maximum volume by week 3

9b: Weekly monitoring checklist

Failure mode: Not processing unsubscribe requests within 24 hours. Under CAN-SPAM rules, commercial email must honour unsubscribe requests within 10 business days. Per FTC CAN-SPAM Act compliance guide, each non-compliance is subject to penalties. Process every unsubscribe request the same business day.

Instantly configuration reference table

Every significant Instantly setting, the recommended value, and what happens when you get it wrong.

Advanced tactics

Inbox rotation strategy

Instantly distributes sends across all selected inboxes for a campaign. For high-volume campaigns, the inbox rotation strategy determines how evenly reputation risk is distributed.

Recommended setup for scaling:

• Run 5+ inboxes per campaign for any campaign above 200 daily sends
• Group inboxes by domain: never run all inboxes from a single domain (if that domain gets flagged, all campaign sends stop)
• Rotate 2–3 domains: 5 inboxes on domain-a.com, 5 on domain-b.com, 5 on domain-c.com
• This way, a reputation issue with one domain affects only 33% of your daily send capacity, not 100%

ICP segmentation and campaign separation

Never mix multiple ICPs in a single campaign. Create separate campaigns per ICP segment:

• Separate campaigns for different job titles (VP Sales vs. Head of Marketing vs. CTO)
• Separate campaigns for different company sizes (SMB vs. Enterprise)
• Separate campaigns for different industries

Segmentation allows you to identify which ICP produces the highest reply rates, iterate copy per segment independently, and avoid diluting your overall campaign metrics with underperforming segments.

Lead throttling and daily volume control

Rather than importing your full contact list and letting Instantly work through it at maximum speed, throttle the daily lead volume:

1. Import contacts in batches of 500–1,000 at a time
2. Monitor the first batch for 7 days before importing the next
3. This approach lets you catch and fix deliverability issues before they affect your full list

This is particularly important for the first campaign on newly warmed inboxes. Verify performance at small scale before using full inbox capacity.

Unibox management

Instantly's Unibox aggregates replies from all connected inboxes into a single view. Configure Unibox to maximise your response time:

• Enable reply notifications: email notification to your primary inbox when a prospect replies
• Label reply types: positive, neutral, opt-out, auto-reply — Instantly's AI labelling can assist but verify manually for high-value leads
• Set up team assignment if multiple people handle replies — avoid duplicate responses

Zapier integration for CRM sync

For teams using a CRM, connect Instantly to your CRM via Zapier:

• Trigger: lead replies in Instantly
• Action: create deal or update contact status in your CRM

This eliminates manual data transfer between Instantly and your CRM and ensures every reply is logged in your primary sales system.

Troubleshooting guide

Problem 1: Inbox shows “Connection failed” after attempting to add Microsoft 365 account

Symptoms: Instantly shows the inbox as disconnected or displays an authentication error.

Diagnosis: In most cases, this is an OAuth permission issue. Microsoft 365 accounts provisioned through Inframail sometimes require explicit permission grant for third-party app access.

Fix:

1. Log into the Inframail inbox directly (webmail.office.com)
2. Navigate to account security settings and confirm third-party app access is enabled
3. In Instantly, remove the failed account and reconnect using the Microsoft 365 OAuth flow (not SMTP)
4. If the issue persists, use Instantly's SMTP connection method as an alternative with the Inframail SMTP credentials

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Problem 2: Warmup score is not increasing after 2 weeks

Symptoms: Warmup score is stuck at 30–50 after 2 weeks of enabled warmup.

Diagnosis: The warmup network is either not sending emails from this inbox, or the warmup emails are landing in spam at receiving inboxes in the network.

Fix:

1. Verify warmup is enabled (not just shown as enabled) by checking the “Warmup emails sent today” counter in the inbox dashboard
2. Confirm DNS records are correct for the sending domain — a misconfigured DMARC record will cause warmup emails to fail authentication and land in spam
3. Check MXToolbox blacklist status (MXToolbox blacklist checker) for the sending domain — if the domain is on a blacklist, warmup emails are being rejected
4. If DNS and blacklist checks pass: contact Instantly support with the inbox details

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Problem 3: Open rates are below 15% on a campaign launched after warmup

Symptoms: Warmup score was 80+ before launch, but campaign open rates are under 15%.

Diagnosis: This is a deliverability failure, not a subject line problem. Emails are landing in spam.

Fix:

1. Check Google Postmaster Tools for the sending domain — confirm “Domain reputation” shows “Good” or higher
2. Send a test email from the campaign inbox to a personal Gmail and confirm it lands in inbox (not spam or promotions)
3. Check Instantly warmup score post-launch — if it dropped below 70 after launch, the campaign volume was too high for the warmup state
4. Reduce daily campaign sends to 20 per inbox, increase warmup duration by 2 additional weeks, then retest

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Problem 4: Personalisation tokens are showing as literal text in sent emails

Symptoms: Recipients receive emails saying “Hi First Name” or “I noticed Company is expanding.”

Diagnosis: Column mapping was incorrect during CSV import, or lead fields are blank.

Fix:

1. In Instantly, navigate to Leads and open a sample lead record
2. Check whether first_name and company fields are populated
3. If blank: the column was not mapped correctly during import
4. Delete the imported leads, re-import the CSV with correct column mapping
5. If fields are populated in Leads but tokens still show as literal text: the variable name in the sequence step does not match the field name — re-insert the variable token from the personalisation picker

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Problem 5: Bounce rate is above 5% on the first campaign

Symptoms: Instantly reports bounce rate above 5% in the first few days of a campaign.

Diagnosis: Contact list quality is below acceptable threshold. Invalid email addresses are causing hard bounces.

Fix:

1. Pause the campaign immediately — do not let it continue with a 5%+ bounce rate
2. Check the bounce type: hard bounces (invalid addresses) vs. soft bounces (temporary failures)
3. For hard bounces: the contact list contains invalid addresses; contact Quarvio support to review the delivered list against your deliverability guarantee
4. For soft bounces: temporary delivery failures; re-enable the campaign after 24–48 hours
5. Remove all hard-bounced addresses from the Instantly lead list permanently

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Problem 6: Spam complaint rate is rising

Symptoms: Instantly reports spam complaints, or Google Postmaster Tools shows spam rate above 0.10%.

Diagnosis: The message content, the audience targeting, or both are generating spam reports from recipients.

Fix:

1. Pause the campaign immediately
2. Review the message content for trigger phrases: excessive urgency language, financial promises, or copy that reads like marketing email rather than personal correspondence
3. Review the audience targeting: are you reaching people who have any plausible reason to want what you offer?
4. Check the unsubscribe link — if it is not working, recipients who cannot find an easy opt-out mark as spam instead
5. Per Google's email sender guidelines, spam complaint rate must stay below 0.10% for inbox placement to be maintained

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Problem 7: Step 2 follow-up is sending even though the prospect replied

Symptoms: A prospect who replied to step 1 reports receiving the step 2 follow-up.

Diagnosis: “Stop on reply” was not enabled on the campaign, or the reply was categorised as an auto-reply rather than a genuine reply.

Fix:

1. Immediately navigate to Campaigns → [Campaign] → Settings and confirm “Stop sequence on reply” is toggled on
2. Find the affected lead in Instantly and manually mark them as replied to stop their remaining sequence steps
3. Send a personal apologetic note to the lead if the follow-up contained a pitch after their positive reply
4. For future campaigns: verify “Stop on reply” is enabled before activating any campaign

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Problem 8: Campaign sends are going out over the weekend despite setting Mon–Fri schedule

Symptoms: Instantly activity log shows sends on Saturday or Sunday.

Diagnosis: Sending schedule was set at the campaign level but the email account-level schedule was not configured, and they are overriding each other incorrectly; or timezone mismatch is causing Friday evening sends to appear as Saturday in UTC.

Fix:

1. Navigate to Email Accounts → [Account] → Schedule and confirm Mon–Fri is set at the account level
2. Navigate to Campaigns → [Campaign] → Schedule and confirm Mon–Fri is set at the campaign level
3. Verify that the timezone on both levels matches the target audience timezone — a campaign set to Mon–Fri 8am–5pm in IST will send Saturday morning in UK time

Community evidence

Instantly reviews on G2 show a 4.9/5 rating from 2,800+ verified reviews. The most frequently cited factors in positive reviews are the warmup network quality, the ease of inbox rotation across multiple accounts, and the Unibox reply management. Negative reviews most frequently cite the learning curve for infrastructure setup — which is exactly what this guide addresses.

“The warmup is everything. I rushed my first campaign and launched after 5 days. Open rates were 8% and replies were nearly zero. I reset, warmed for 3 weeks, and relaunched. Open rates went to 38% and replies to 11%. Same list, same messages. The warmup is the whole game.”

— Verified G2 reviewer, founder, outbound agency, Instantly reviews on G2

“Inframail plus Instantly is the setup I recommend to everyone. Inframail handles all the DNS configuration so I do not have to touch SPF records or DKIM keys. The inboxes are ready in 24 hours and then I connect them to Instantly and start warmup. The whole infrastructure is set up in an afternoon.”

— Verified G2 reviewer, cold email consultant, Instantly reviews on G2

“The settings that matter most in Instantly are the ones that are easy to miss: the random send delay, the stop-on-reply toggle, the custom tracking domain. I have audited 30+ Instantly accounts for clients and almost every underperforming setup is missing at least one of these three. Once fixed, open rates improve within a week.”

— Verified G2 reviewer, deliverability consultant, Instantly reviews on G2

Our actual stack

Frequently asked questions

How long does it take to set up Instantly from scratch to first send?

Account setup and inbox connection takes 2–3 hours of active configuration. However, the warmup phase requires a minimum of 2–4 weeks before any cold outreach should launch. Total elapsed time from starting the process to sending your first properly delivered campaign: 3–4 weeks. Teams that try to compress this by shortening warmup consistently report open rates below 15% and often damage their sending domains.

Do I need Inframail if I already have Google Workspace inboxes?

You should not use Google Workspace inboxes on your primary business domain for cold outreach. The risk is domain-level: if a cold outreach campaign generates spam complaints, those complaints affect the sending domain's reputation with Google, which impacts all email sent from that domain — including customer correspondence and internal email. Inframail provisions dedicated Microsoft 365 inboxes on separate domains specifically for cold outreach. The primary business domain is completely isolated.

How many email accounts do I need in Instantly?

Calculate based on target daily send volume at 30–40 emails per inbox per day: 3 inboxes for 90–120 sends per day, 5 inboxes for 150–200, 10 inboxes for 300–400, 20 inboxes for 600–800. Add inboxes in groups of 3–5 rather than one at a time, warming each new group in parallel before deploying it. Starting with 3–5 inboxes is appropriate for most initial setups; scale up as you validate campaign performance metrics.

What Instantly plan should I choose?

Growth ($30/month) allows up to 5 sending accounts, which is appropriate for initial testing with 3–5 Inframail inboxes. Hypergrowth ($77.60/month) offers unlimited sending accounts, which is necessary once you scale beyond 5 inboxes. Most teams reach Hypergrowth within 60 days of their first campaign if results are positive. Light Speed ($286.30/month) is for operations running continuous high-volume campaigns across 30+ inboxes.

What open rate and reply rate should I expect from Instantly?

Per Woodpecker's 2025 cold email benchmark study, average reply rates across all senders run 8.5%; the top quartile achieves 15–20%. Open rates for properly delivered cold email with strong subject lines run 30–50%. If your open rate is below 20%, the problem is deliverability (check warmup score, DNS records, blacklist status). If open rate is healthy but reply rate is below 3%, the problem is message quality or audience fit.

What is the warmup score in Instantly and what does each range mean?

Instantly's warmup score is a composite metric derived from the warmup network's behaviour with each inbox — primarily: are warmup emails landing in inbox vs. spam at network recipients, and what is the reply rate to warmup emails? A score of 80–89 indicates the inbox is ready for standard cold outreach volumes. A score of 90+ indicates optimal deliverability for higher-volume sending. A score below 70 means the inbox needs additional warmup before any campaign sends should begin.

Can I use Instantly with Zapier to connect to my CRM?

Yes. Instantly Zapier integrations allow you to trigger actions based on Instantly events — most commonly: when a lead replies in Instantly, create or update a deal in your CRM. This is particularly valuable for teams managing replies at scale in Unibox. Set up the Zapier connection in the Instantly settings under Integrations.

How do I handle unsubscribe requests in Instantly?

Instantly's unsubscribe link (when enabled in campaign settings) automatically marks a lead as unsubscribed when they click the link. This prevents them from receiving any further emails from that campaign. For leads who reply asking to unsubscribe (rather than clicking the link): find the lead in Instantly and manually mark them as unsubscribed or as do-not-contact. Per FTC CAN-SPAM Act compliance guide, unsubscribe requests must be honoured within 10 business days; process them the same day.

How do I set up reply tracking and Unibox in Instantly?

Reply tracking is automatic for all connected inboxes in Instantly. When a prospect replies to a campaign email, the reply appears in Instantly's Unibox alongside all other replies from all connected inboxes. Enable reply notifications under Settings → Notifications to receive an email alert when a new reply arrives. In Unibox, label replies by type (positive, neutral, opt-out, auto-reply) to manage follow-up efficiently. Assign replies to team members if multiple people are handling inbox management.

What should I do if my sending domain gets blacklisted?

Immediately pause all campaign sends from that domain. Run MXToolbox blacklist checker to identify which blacklist has listed the domain. Most blacklists have a delisting request process — navigate to the blacklist's website, find their removal request form, and submit. Common blacklists (Spamhaus, Barracuda) process removal requests within 24–72 hours when the root cause (spam complaints, bounce volume) has been resolved. While delisting is pending, route campaign sends through a different domain.

How many sequence steps should a cold email campaign have?

Three steps over 7 days is the practical standard for most B2B outreach. The first two steps generate approximately 70% of all replies, per Instantly's cold email benchmark report. Adding steps 4 and 5 captures a small additional percentage but increases opt-out volume. For enterprise accounts with long sales cycles, 4–5 steps over 14–21 days is appropriate; for high-volume SMB prospecting, 2 steps over 3 days maximises throughput.

How do I run multiple campaigns simultaneously in Instantly?

Create separate campaigns for each ICP segment, each with its own sequence copy, contact list, and sending configuration. All campaigns share the same pool of connected inboxes — Instantly distributes daily sends across all active campaigns. Monitor per-campaign metrics independently to identify which ICP and message angle performs best. Do not run more active campaigns than your daily inbox capacity can support at 30–40 emails per inbox per day.

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