Apollo Email Verification vs a Dedicated Verifier

TL;DR

Apollo statuses: Verified, Likely to engage, Unverified, Update required, Unavailable, plus a catch-all filter.
Apollo says it verifies in seven steps using its own network, connected inboxes, delivery statistics and bounce monitoring, and claims 91% accuracy (vendor-stated).
Apollo argues third-party verifiers wrongly reject valid catch-alls; you'll see that disagreement in the wild.
Re-verify exports before you send, because data ages between the day Apollo checked and the day you launch.

What Apollo does

Apollo assigns each email a status and recommends sequencing only "verified" or "likely to engage" contacts. Since December 2025 its waterfall enrichment queries 20+ providers and can add a data-validator step. It claims 91% accuracy and "45% fewer bounces" for the waterfall; both are vendor statements. Credit refunds apply only when a verified email sent from inside Apollo bounces within 30 days.

Why exports still bounce

Time. The status describes when Apollo last checked, not the day you send.
Catch-alls. Apollo's position is that many catch-all addresses are valid; a standalone verifier will mark them risky because it can't prove the mailbox exists. Both can be right.
Different definitions. "Likely to engage" isn't a delivery check.
Sending outside Apollo. The refund rule only helps for mail sent in Apollo.

Using both

Export from Apollo, keeping Verified and Likely to engage; set Unverified aside.
Run the export through a dedicated verifier. Remove undeliverable.
Decide on catch-alls deliberately. Hunter's published data found accept-all addresses bounced 27% against 1% for valid addresses, so send small slices first. Catch-alls in cold email.
Send. Re-verify before later sequence steps.

Cost

Apollo's extra email credits cost about $0.20 each, so verifying inside Apollo isn't a cost saver; a dedicated verifier at $0.0058 or less per address is cheap insurance on top of what you've already paid for. More on the workflow: verify an Apollo export and why Apollo emails bounce.

FAQ

Are Apollo emails accurate?

Apollo claims 91% accuracy (its own figure). Real bounce rates vary by list; test a sample from your export.

Should I verify Apollo exports?

Yes: status is a point-in-time label, and bounces cost reputation. A quick pass removes the undeliverable ones.

Does Apollo refund bounced emails?

Only a verified email sent inside Apollo that bounces within 30 days, according to its data-requests article.

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Email	Verdict	Why
[email protected]	deliverable	Mailbox exists
[email protected]	risky	Shared inbox
[email protected]	risky	Accepts every address
[email protected]	undeliverable	Mailbox not found
[email protected]	undeliverable	Typo in the domain

Apollo's email verification vs a dedicated verifier