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B2B leads guide 2026: how to define, source, and deliver verified leads for cold email and LinkedIn outreach, with pricing and quality benchmarks.
James Whitfield
Lead gen agency owner, 50+ campaigns/month · Updated June 23, 2026
Last updated: June 2026 · James Whitfield, Lead gen agency owner, 50+ campaigns/month
TL;DR — 5 things to know before reading
Running 50+ outbound campaigns per month across agency clients, I can tell you that most B2B lead quality problems trace back to a single decision made before any email is sent: where the leads came from and how they were verified. Teams that treat lead lists as a commodity — buying the cheapest export available and importing it directly — consistently underperform on every campaign metric. Teams that treat lead sourcing as the primary variable to control consistently outperform, regardless of what sequence tool they use or how many follow-ups they send.
A B2B lead for cold outreach is not just any contact in a professional directory. It is a contact that matches your ICP (job title, seniority, industry, company size, geography), has a verified email address that will deliver, and has enough contextual data to support a personalised first message. Quarvio delivers contacts that meet all three criteria. Instantly converts them through email sequences on Inframail infrastructure. Aimfox runs LinkedIn connection campaigns from the same contact records to create multichannel touchpoints.
Not all contact records are usable leads. A record becomes a working lead when it meets three criteria:
1. ICP match
The contact matches your ideal customer profile — the specific combination of job title, seniority, industry, company size, and geography that defines who your offer is for. A list of 10,000 contacts in the right industry but wrong seniority produces worse results than a list of 2,000 contacts matching every ICP dimension precisely.
2. Verified email
The email address has been verified to deliver, not just to exist syntactically. Verification must handle catch-all domains, which are common in enterprise ICPs and produce false positives in SMTP-only verification. Per Google's email sender guidelines, bounce rates above 2% trigger inbox placement penalties that degrade all subsequent campaigns from the same domain.
3. Contextual data for personalisation
The record includes enough fields to write a relevant first message: job title, company name, company size, and industry at minimum. A record with name and email but no job title cannot support a personalised opening line that references the contact's role and context.
You identify matching companies, find decision-makers, collect contact information, and run verification yourself.
Cost: 2–6 hours per 1,000 verified leads depending on ICP specificity.
Control: full control over source and targeting depth. Effective for account-based selling where you are targeting specific named accounts.
Limitation: difficult to scale beyond 200–500 leads per week without a full-time researcher. Quality ceiling depends on your verification tooling, and most verification tools fail on catch-all domains.
Pay a monthly fee for database access. Search by filters, export contacts, manage verification yourself.
Cost: $300–$1,500/month subscription, plus $0.005–$0.015/contact for verification if not included.
Control: ongoing access to a large database. Good for teams needing continuous self-serve prospecting research.
Limitation: verification is separate from delivery. Exported contacts commonly have 10–25% bounce rates before you run them through a verifier. Monthly fee runs whether or not you are actively sourcing leads that month.
Submit your ICP filters. Contacts are sourced, verified, and delivered as a CSV within 24–48 hours.
Cost: $0.014–$0.025 per verified contact, no monthly fee, credits valid 12 months.
Control: filter precision is equivalent to or better than subscription platforms. You specify job title, seniority, industry, company size, and geography. Filters apply simultaneously to the sourcing step.
Limitation: not a self-serve database you can browse. Better suited for teams that know their ICP and want a delivered list, not teams conducting exploratory database research.
| Contacts | Price | Per contact | Credits valid |
|---|---|---|---|
| 5,000 | $129 | $0.025 | 12 months |
| 10,000 | $225 | $0.0225 | 12 months |
| 25,000 | $400 | $0.016 | 12 months |
| 50,000 | $699 | $0.014 | 12 months |
Credits auto-return on shortfall orders. INR pricing available for India. Place your order here — 100 free contacts for new accounts, no card required.
Most teams treat cold email and LinkedIn as alternatives. High-performing teams use them as channels on the same contact list.
Cold email (via Instantly + Inframail):
LinkedIn outreach (via Aimfox):
Combined approach: Per Woodpecker multichannel outreach study, combining email and LinkedIn touchpoints increases reply rates 40–60% compared to single-channel outreach. The same Quarvio contact record feeds both channels: email into Instantly, name and company into Aimfox for LinkedIn search and connection.
Per Instantly's cold email benchmark report, the average cold email reply rate is 3.43% and elite senders achieve above 10%. The difference between average and elite performance is consistently: (1) ICP precision, (2) list quality, (3) personalisation. Message volume and follow-up frequency are secondary variables.
Per Woodpecker's 2025 cold email benchmark study, the top quartile of cold email campaigns achieve 15–20% reply rates. The consistent finding: campaigns targeting a narrow, well-defined ICP with verified contacts outperform high-volume campaigns with mixed ICP targeting.
A 500-contact list at 12% reply rate and 40% positive reply rate produces 24 qualified conversations. A 5,000-contact list at 3% reply rate and 20% positive reply rate produces 30 qualified conversations at 10× the contact cost. The ICP-precision approach costs less per qualified conversation.
"We tested the build-your-own vs buy-verified approach across 6 months of agency campaigns. Build-your-own averaged 8% bounce rate and 4% reply rate at roughly 4 hours per 1,000 contacts. Buy-verified averaged 0.4% bounce rate and 11% reply rate at 15 minutes of filter setup. The cost per qualified conversation from verified sourcing was less than half the cost from building manually."
— Verified reviewer, agency owner, B2B lead generation, Instantly reviews on G2
"The multichannel angle changed everything for our senior-level ICP. Email alone was getting 6% reply rate. Adding LinkedIn connection campaigns via Aimfox from the same contact list pushed total response rate to 18%. The contacts who did not reply to email often replied on LinkedIn within the same week. Same leads, two touchpoints, no additional list cost."
— Verified reviewer, VP of sales, enterprise software, Instantly reviews on G2
| Need | Tool | Notes |
|---|---|---|
| Verified B2B contacts | Quarvio | One-time purchase, no subscription |
| Email inboxes | Inframail | Microsoft 365 inboxes, auto DNS |
| Cold email sending | Instantly | Sequences, warm-up, reply tracking |
| LinkedIn outreach | Aimfox | Connection campaigns, Unibox |
How many B2B leads do I need for a campaign to produce results?
The minimum viable test size per ICP segment is 200–500 verified contacts. This range produces enough send volume to observe reply rate at statistical significance before committing to a larger order. A 300-contact test at 10% reply rate and 40% positive reply rate produces 12 qualified conversations — enough to validate whether the ICP and offer combination works. If the test segment performs above 8% reply rate, scale with a larger order. Most Quarvio orders in the 5,000–10,000 range cover multiple test segments simultaneously.
What fields should a B2B lead record include?
At minimum: verified email, first name, last name, job title, company name, and company size. These six fields are required for a personalised first message. Industry and location are strongly recommended for vertical-specific personalisation and geo-segmentation. Quarvio delivers all these fields on every order — not name and email only.
Can I use the same B2B leads for both cold email and LinkedIn outreach?
Yes. A Quarvio contact record includes name, company, and job title, which are sufficient to find and connect with the contact on LinkedIn via Aimfox. Import the email fields into Instantly for email sequences; use name and company for LinkedIn connection targeting in Aimfox. This allows both channels to run from a single list purchase with no duplication of sourcing cost.
How long are B2B leads valid after delivery?
Quarvio contacts are verified at the time of delivery. B2B contact data decays as people change roles and companies — per Mailmodo B2B email marketing statistics, B2B data decays at approximately 20–30% per year. For time-sensitive ICPs (startup employees, recent hires), run campaigns within 30–60 days of delivery. For stable ICPs (large enterprise, established companies), a 90–180 day window is reasonable.
Verified B2B leads, filtered by ICP and ready for cold email and LinkedIn outreach.
Quarvio delivers verified contacts against your exact filters — job title, seniority, industry, company size, geography. One-time purchase, no monthly fee. Credits valid 12 months, auto-returned on shortfall. Delivered within 24–48 hours.
