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Email verification & deliverability tools compared
Email list verification, warm-up, inbox placement and DMARC tools we've reviewed, compared on price and free credits.
This page is for anyone whose emails need to reach the inbox: businesses sending newsletters, sales teams sending cold email, and site owners whose order confirmations land in spam. The tools here clean lists of bad addresses, warm up new mailboxes, test where your email lands, and set up the DMARC, SPF and DKIM records that prove your email is really from you. If you send a few personal emails from Gmail, you don't need any of this.
Match the tool to the problem. Bouncing emails call for list verification, usually paid per credit. A new domain or mailbox for outreach calls for warm-up. Mail landing in spam calls for placement tests and authentication. Look at the price per thousand checks, whether credits expire, and refund rules, since many tools here don't refund. Fix the basics, like authentication and a clean list, before paying for anything expensive.
Prices we saw ran from free credits and about $7 a week for bulk verification to $96 or more a mailbox a month for done-for-you deliverability work.
Best for
- Best free start for list cleaning: ZeroBounce. 100 free validation credits every month.
- Best for app and website email: SMTP2GO. 1,000 free emails a month and a 30-day money-back guarantee.
- Best for testing where email lands: GlockApps. A free plan, and Essential at $59 a month billed yearly.
Picked from the prices and terms in the table below, checked on the dates shown. Our blue Our Pick label is separate: how we choose.
Compare all 15
| Company | Main use | Best for | Starting price | Trial, refund or free plan | Prices checked |
|---|---|---|---|---|---|
| SMTP2GO Vetteroo Our Pick | Sending service (SMTP and API) | Businesses and developers sending app and website email reliably | Free (1,000 emails/mo); Starter $15/mo | Free plan; 30-day money-back guarantee | October 29, 2026 |
| mailfloss Vetteroo Our Pick | Automatic list cleaning | Email marketers who want lists cleaned automatically | From $29/month | 7-day trial; refunds not promised | October 30, 2026 |
| Allegrow Checked by Vetteroo | Spam-folder fixes for outbound | Outbound teams fighting spam-folder placement | Starter $99/month | No refunds after 14 days | October 30, 2026 |
| Clearout Checked by Vetteroo | List verification and form checks | Marketers who want a well-rated verifier | Free 100 credits; from $16/month billed yearly | Free credits; no refunds | October 30, 2026 |
| EasyDMARC Checked by Vetteroo | DMARC, SPF and DKIM setup | Businesses and IT teams setting up DMARC to stop email spoofing | DMARC Plus $35.99/mo billed yearly ($44.99 monthly) | Free trial, no card | October 29, 2026 |
| Emailable Checked by Vetteroo | List verification | List owners who want pay-as-you-go verification | 5,000 credits $38 | 250 free credits; no refunds | October 30, 2026 |
| EmailListVerify Checked by Vetteroo | List verification | Anyone cleaning an email list before a send | $27.99 per 10,000 checks See price | Limited refunds | October 31, 2026 |
| Folderly Checked by Vetteroo | Done-for-you deliverability fixes | Teams with serious deliverability problems | $96/mailbox/month billed yearly | Free tests; fees non-refundable | October 30, 2026 |
| GlockApps Checked by Vetteroo | Inbox placement tests | Marketers who test where their email lands | Free plan; $59/month billed yearly | Free plan; refund if unused | October 30, 2026 |
| MailReach Checked by Vetteroo | Warm-up and spam tests | Senders who need cold email to land in the inbox | $25/mailbox/month | No refund for a started month | October 30, 2026 |
| MailTester Ninja Checked by Vetteroo | Flat-fee bulk verification | High-volume senders who want flat-fee verification | From $6.99/week | Refunds case by case | October 30, 2026 |
| Mailwarm Checked by Vetteroo | Done-for-you warm-up | Senders who want warm-up plus expert calls | From $69/month billed yearly | No refunds | October 30, 2026 |
| Warmup Inbox Checked by Vetteroo | Warm-up and placement monitoring | Cold email senders who want new inboxes to land outside spam | Free plan; Basic $15/inbox/mo yearly See price | 7-day free trial, no card | October 31, 2026 |
| Warmy Checked by Vetteroo | Warm-up and testing | Senders warming new mailboxes | From $49/month | 7-day trial; no refunds | October 30, 2026 |
| ZeroBounce Checked by Vetteroo | List verification | Marketers who need to clean email lists before sending | Free 100/mo; $39 for 2,000 credits | 100 free credits monthly | October 30, 2026 |
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How we checked
We checked each tool's pricing, free credits and refund terms on the date shown, and read its help pages for what it covers. We didn't run our own deliverability tests.
Our reviews
SMTP2GO Vetteroo Our Pick
Email delivery service (SMTP relay and API).
Read more →Reviewmailfloss Vetteroo Our Pick
Automatic email list cleaning for email marketing tools.
Read more →ReviewAllegrow Checked by Vetteroo
Email deliverability tools: spam-folder fixes, inbox placement and list verification.
Read more →ReviewClearout Checked by Vetteroo
Email verification, finder and form protection.
Read more →ReviewEasyDMARC Checked by Vetteroo
DMARC, SPF and DKIM email authentication tools.
Read more →ReviewEmailable Checked by Vetteroo
Email verification and deliverability credits.
Read more →ReviewEmailListVerifyChecked by Vetteroo
Email list cleaning and verification.
Read more →ReviewFolderly Checked by Vetteroo
Email deliverability fixes, warm-up and inbox placement tests.
Read more →ReviewGlockApps Checked by Vetteroo
Inbox placement tests, DMARC monitoring and email warm-up.
Read more →ReviewMailReach Checked by Vetteroo
Email warm-up and spam testing to keep cold email out of spam.
Read more →ReviewMailTester Ninja Checked by Vetteroo
Bulk email verification on weekly or monthly plans.
Read more →ReviewMailwarm Checked by Vetteroo
Done-for-you email warm-up with deliverability calls.
Read more →ReviewWarmup Inbox Checked by Vetteroo
Email warmup and inbox placement monitoring for cold email senders.
Read more →ReviewWarmy Checked by Vetteroo
Email warm-up and deliverability testing.
Read more →ReviewZeroBounce Checked by Vetteroo
Email list validation and deliverability tools.
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