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How to buy B2B email lists in 2026: what verified means, pricing tiers, deliverability guarantees, and what to check before placing your first order.
Priya Nair
B2B growth marketer, ex-Apollo user · Updated June 23, 2026
Last updated: June 2026 · Priya Nair, B2B growth marketer, ex-Apollo user
TL;DR — 5 things to know before reading
Most B2B email lists fail not because of bad copy or weak sequences — they fail because the contact data was never properly verified. A list of 5,000 contacts with a 25% bounce rate means 1,250 emails never reached a human inbox, your sending domain took a reputation hit, and you paid for contacts you cannot use. The problem is not volume. The problem is verification happening after export rather than before delivery.
When you buy a B2B email list, you are making one core decision: whether to pay for contacts that have been verified before delivery, or contacts exported from a database and left for you to verify yourself. Quarvio delivers pre-verified contacts — meaning the verification work is complete before the CSV lands in your account. Instantly runs the campaigns on Inframail infrastructure. Aimfox handles parallel LinkedIn outreach when you want multichannel coverage from the same contact data.
The term "verified" is used loosely in the B2B data market. Before placing any order, confirm what the provider actually checks:
Syntax verification (minimum, not sufficient): confirms the email address format is valid. This catches typos, not bad addresses. Any functional tool does this automatically.
Domain MX check (better, still not sufficient): confirms the domain has valid mail exchange records and can receive email. Catches defunct company domains but does not tell you whether the specific address exists at a live domain.
SMTP handshake (the meaningful check): the verification system connects to the mail server and checks whether the specific address accepts delivery, without sending an actual email. This is where most providers catch invalid addresses and is the minimum acceptable standard.
Live deliverability validation (what Quarvio does for catch-all domains): catch-all domains — domains that appear to accept all email at the SMTP level — are verified via live deliverability checks. Most providers either exclude catch-all addresses entirely (shrinking your list and losing a large share of decision-makers) or include them unverified (passing bounce risk directly to you). Quarvio verifies catch-all addresses with live deliverability validation, so a contact marked valid is valid regardless of domain type.
What this means in practice: a list with only syntax and MX verification can still produce 5–15% bounce rates. A list with full SMTP verification typically produces 2–5% bounce rates. A list with live deliverability validation for catch-all domains typically produces under 1% bounce rates. Per Google's email sender guidelines, bounce rates above 2% signal list quality problems to spam filters; above 3%, inbox placement penalties apply to your sending domain.
Every Quarvio list is delivered as a clean CSV file containing the following fields:
| Field | Description |
|---|---|
| First name | Contact's first name |
| Last name | Contact's last name |
| Verified email | Email address verified for deliverability |
| Job title | Current title at current employer |
| Company name | Company the contact is employed at |
| Company size | Employee headcount range |
| Industry | Standardised industry classification |
| Location | Country and city when available |
The CSV imports directly into Instantly, Smartlead, or any standard cold email platform. Field names match standard import formats — no field remapping required for most tools.
| Contacts | Price (USD) | Per-contact cost | 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 are valid for 12 months from purchase. If your order yields fewer contacts than reserved (for example, your filters return 4,800 contacts on a 5,000-credit order), the unused 200 credits auto-return to your balance. You are never charged for contacts not delivered. INR pricing is available for buyers in India — see pricing page for current rates.
Subscription platforms charge monthly regardless of whether you use all your credits. They also typically do not include email verification in the base subscription — verification costs extra or is passed to the customer to handle separately.
The comparison that matters is cost per usable contact (verified, delivered, not bounced):
| Metric | Subscription platform (typical) | Quarvio |
|---|---|---|
| Monthly fee | $500–$1,500/month | $0 |
| Typical bounce rate | 15–30% | Under 1% |
| True cost per usable contact | $0.047+ (after bounce loss) | $0.014–$0.025 |
| Credits expire | Monthly (lost if unused) | 12 months (roll over) |
| Seat limits | 1–3 per plan | None |
| Unused credits on shortfall | Forfeited | Auto-returned |
Source: Quarvio pricing as above; subscription platform bounce rate data from Mailmodo B2B email marketing statistics.
On a subscription platform exporting 10,000 contacts with a 25% bounce rate, you paid for 10,000 but received 7,500 usable contacts. Your effective cost per usable contact is 33% higher than the listed rate — before you factor in re-verification costs. Quarvio's guarantee addresses this directly: if deliverability falls below 90% on a delivered list, report it within 7 days with your bounce data and credits are returned for the difference.
If filters yield fewer contacts than ordered, unused credits return to your balance automatically. There is no minimum commitment beyond your current order, and no subscription to cancel.
Every Quarvio list ships verified. If deliverability falls below 90% on any delivered list, report it within 7 days of delivery with your bounce export and credits are returned for the shortfall above the 10% threshold. For example: if 1,000 contacts were delivered and 150 bounced (15%), credits return for the 50 contacts that exceeded the 10% allowance. The guarantee means the downside risk of a low-quality list stays with Quarvio, not with you.
"Switched from a subscription platform to Quarvio for our last two campaigns. The bounce rate was the first thing I noticed — from averaging 8–12% bounces down to under 1%. Campaign performance improved directly from there. We stopped paying monthly for credits we weren't fully using."
— Verified reviewer, head of sales, B2B software company, Instantly reviews on G2
"The math on monthly subscriptions stopped working for us at about campaign number four. We were paying for a full month of credits, using 40%, losing the rest at month-end. A one-time list order at the right verified quality lasts six weeks of campaigns and costs less than one month of our old subscription. Quality has been consistently better as well — bounce rates under 0.8%."
— Verified reviewer, founder, outbound agency, Instantly reviews on G2
Per Instantly's cold email benchmark report, elite senders achieve reply rates above 10% while the average sits at 3.43%. The gap between average and elite is almost entirely explained by list quality and targeting precision rather than sending volume or message copy. Verified, targeted contact data is the primary performance lever.
Does the provider verify before delivery or after export? Verification at the point of delivery is what matters. Post-export verification services that you run yourself add time and cost, and still do not address catch-all domains reliably.
What is the bounce rate guarantee? Any provider unwilling to state a deliverability floor or offer credits for high-bounce lists is selling unverified data. Look for a written commitment of 90%+ deliverability.
What fields are included? At minimum: first name, last name, verified email, and job title. Without job title and company, personalisation is impossible and campaign performance suffers accordingly.
How are credits handled when filters yield fewer contacts? If your ICP filters return fewer contacts than ordered, do unused credits return to your balance automatically or are they forfeited? This distinction is significant for buyers with niche audiences.
Is there a subscription or can you buy once? Monthly subscriptions charge regardless of actual usage. One-time purchases align cost directly with what you use.
| 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 do I know if the B2B email list I buy is actually verified?
Ask the provider two questions before ordering: what type of email verification do they run, and what is their bounce rate guarantee. A provider verifying with full SMTP handshake plus live deliverability checks for catch-all domains will commit to under 1% bounce rates. A provider that only runs syntax and MX checks cannot make that commitment honestly. Quarvio guarantees 90%+ deliverability on every list and returns credits for any shortfall reported within 7 days of delivery.
What is the minimum order size when buying B2B email lists?
Quarvio starts at 5,000 contacts for $129. For initial testing, the free 100-contact trial lets you verify quality before committing to a larger order. Most cold email campaigns targeting a defined job title, industry, and geography need 500–2,000 contacts to generate statistically meaningful performance data. Start small, validate, then scale.
How long does it take to receive a purchased B2B email list?
Quarvio delivers within 24–48 hours of order placement. Most orders arrive sooner. The CSV is available for download from your dashboard — you receive an email notification when the list is ready. There is no manual follow-up or support ticket required.
Do I need a separate email verification service after buying from Quarvio?
No. Verification is completed before delivery on every Quarvio order. Import the delivered CSV directly into Instantly or your chosen sending platform. Running a separate verification service on a pre-verified list is redundant and does not improve deliverability further.
What happens if my delivered list produces high bounce rates?
If deliverability on a Quarvio-delivered list falls below 90%, email the bounce export to hello@quarvio.io within 7 days of delivery and credits return for the excess above the 10% threshold. Credits apply to your next order. Cash refunds apply only in cases of non-delivery or payment failure.
Verified B2B contacts, delivered within 24–48 hours.
Quarvio delivers pre-filtered, verified contact lists by job title, industry, company size, and geography. One-time purchase — no subscription, no monthly fee. Credits valid for 12 months, unused credits auto-returned on shortfall. If deliverability falls below 90%, credits return for the difference.
