 ZeroBounce | $39 | Yes | 27/100 | Free plan with 100 validation credits a month (business-domain signup). Pay-as-you-go from $39 for 2,000 credits. ZeroBounce ONE subscription from $99/mo for 10,000 credits, 20% off billed annually; over 1M credits is sales-led. Source | 2026-10-14 |
 NeverBounce | $8 | No | 17/100 | Pay as you go from $8 for 1,000 credits ($0.008 each); credits expire 12 months after purchase. Growth plan $49/mo for up to 10,000 verifications; Enterprise is custom. Free test credits with no card required; no ongoing free plan. Source | 2026-10-14 |
 Maildoso | $75/mo | No | 7/100 | Monthly per-mailbox plans: 30 mailboxes for $75/mo ($2.50 each), 300 for $225/mo, 1,000 for $499/mo; domains extra at $15/year; quarterly plans with domains included are labelled legacy. 30-day money-back guarantee on monthly packages; no free plan or trial. Source | 2026-10-14 |
 Mailforge | $3/mailbox/mo | No | Thin evidence | Usage-based: $3 per mailbox slot per month, minimum 10 slots, with 2 months free on annual billing; .com domains $14/year each; optional SSL and domain masking at $2 per domain per month. No free plan or trial; no contract. Source | 2026-10-14 |
 Zapmail | $39/mo | No | Thin evidence | Starter $39/mo billed monthly with 10 Google or Microsoft mailboxes included (extra mailboxes $3.50 each); Growth $99/mo with 30; Pro $299/mo with 100. Quarterly and yearly billing advertise 2 months free. No free plan or trial mentioned. Source | 2026-10-14 |
 MillionVerifier | $39 | No | Thin evidence | Pay-as-you-go credits with no contracts, from $39 (smallest pack size not stated on the page); 50,000 verifications for $89 and 1 million for $449. Credits never expire; 100 free credits with no card required; refunds for emails it can't verify with certainty. Source | 2026-10-14 |
 MailReach | $19.50/mailbox/mo | No | Thin evidence | $19.50 per mailbox per month for warmup plus spam tests (at least 20 spam-test credits included), with 20% off on annual billing; spam-test credits also sold separately, monthly or pay as you go; agency pricing on request. No free plan or trial listed beyond a free one-off spam test. Source | 2026-10-14 |
 Infraforge | $4/mailbox/mo | No | Thin evidence | Usage-based: $4 per mailbox slot per month billed quarterly (yearly billing gives 2 months free), minimum 10 slots; .com domains $14/year; add-ons include dedicated IPs at $99 per IP per month. No free plan or trial; no contract. Source | 2026-10-14 |