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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

CompanyMain useBest forStarting priceTrial, refund or free planPrices checked
SMTP2GO Vetteroo Our PickSending service (SMTP and API)Businesses and developers sending app and website email reliablyFree (1,000 emails/mo); Starter $15/moFree plan; 30-day money-back guaranteeOctober 29, 2026
mailfloss Vetteroo Our PickAutomatic list cleaningEmail marketers who want lists cleaned automaticallyFrom $29/month7-day trial; refunds not promisedOctober 30, 2026
Allegrow Checked by VetterooSpam-folder fixes for outboundOutbound teams fighting spam-folder placementStarter $99/monthNo refunds after 14 daysOctober 30, 2026
Clearout Checked by VetterooList verification and form checksMarketers who want a well-rated verifierFree 100 credits; from $16/month billed yearlyFree credits; no refundsOctober 30, 2026
EasyDMARC Checked by VetterooDMARC, SPF and DKIM setupBusinesses and IT teams setting up DMARC to stop email spoofingDMARC Plus $35.99/mo billed yearly ($44.99 monthly)Free trial, no cardOctober 29, 2026
Emailable Checked by VetterooList verificationList owners who want pay-as-you-go verification5,000 credits $38250 free credits; no refundsOctober 30, 2026
EmailListVerify Checked by VetterooList verificationAnyone cleaning an email list before a send$27.99 per 10,000 checks
See price
Limited refundsOctober 31, 2026
Folderly Checked by VetterooDone-for-you deliverability fixesTeams with serious deliverability problems$96/mailbox/month billed yearlyFree tests; fees non-refundableOctober 30, 2026
GlockApps Checked by VetterooInbox placement testsMarketers who test where their email landsFree plan; $59/month billed yearlyFree plan; refund if unusedOctober 30, 2026
MailReach Checked by VetterooWarm-up and spam testsSenders who need cold email to land in the inbox$25/mailbox/monthNo refund for a started monthOctober 30, 2026
MailTester Ninja Checked by VetterooFlat-fee bulk verificationHigh-volume senders who want flat-fee verificationFrom $6.99/weekRefunds case by caseOctober 30, 2026
Mailwarm Checked by VetterooDone-for-you warm-upSenders who want warm-up plus expert callsFrom $69/month billed yearlyNo refundsOctober 30, 2026
Warmup Inbox Checked by VetterooWarm-up and placement monitoringCold email senders who want new inboxes to land outside spamFree plan; Basic $15/inbox/mo yearly
See price
7-day free trial, no cardOctober 31, 2026
Warmy Checked by VetterooWarm-up and testingSenders warming new mailboxesFrom $49/month7-day trial; no refundsOctober 30, 2026
ZeroBounce Checked by VetterooList verificationMarketers who need to clean email lists before sendingFree 100/mo; $39 for 2,000 credits100 free credits monthlyOctober 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

Review

SMTP2GO Vetteroo Our Pick

Email delivery service (SMTP relay and API).

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Review

mailfloss Vetteroo Our Pick

Automatic email list cleaning for email marketing tools.

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Review

Allegrow Checked by Vetteroo

Email deliverability tools: spam-folder fixes, inbox placement and list verification.

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Review

Clearout Checked by Vetteroo

Email verification, finder and form protection.

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Review

EasyDMARC Checked by Vetteroo

DMARC, SPF and DKIM email authentication tools.

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Review

Emailable Checked by Vetteroo

Email verification and deliverability credits.

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Review

EmailListVerifyChecked by Vetteroo

Email list cleaning and verification.

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Review

Folderly Checked by Vetteroo

Email deliverability fixes, warm-up and inbox placement tests.

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Review

GlockApps Checked by Vetteroo

Inbox placement tests, DMARC monitoring and email warm-up.

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Review

MailReach Checked by Vetteroo

Email warm-up and spam testing to keep cold email out of spam.

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Review

MailTester Ninja Checked by Vetteroo

Bulk email verification on weekly or monthly plans.

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Review

Mailwarm Checked by Vetteroo

Done-for-you email warm-up with deliverability calls.

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Review

Warmup Inbox Checked by Vetteroo

Email warmup and inbox placement monitoring for cold email senders.

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Review

Warmy Checked by Vetteroo

Email warm-up and deliverability testing.

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Review

ZeroBounce Checked by Vetteroo

Email list validation and deliverability tools.

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