TL;DR
- Apollo claims about 91% accuracy for its verification, so a share of "verified" emails will be wrong on day one.
- Verified is a past judgement. Lists decay as people move jobs, and catch-all domains pass Apollo's checks then bounce later.
- Apollo only refunds bounces sent from inside Apollo. If you send from Instantly or Smartlead, re-verify the export first.
What Apollo's "Verified" badge means
Apollo grades emails with a multi-step process that draws on its contributor network, connected inboxes, CRM data, delivery statistics and bounce monitoring, and it claims about 91% accuracy (how Apollo verifies emails, checked 2026-10-17). Statuses run from Verified and Likely to engage through Unverified, Update required and Unavailable, and Apollo's own advice is to sequence only the first two (Apollo bounce troubleshooting).
That's a useful signal, but it's a prediction, not a live mailbox check at the moment you export. 91% also means roughly 1 in 11 can be wrong before the list has aged at all.
Five reasons verified Apollo leads bounce
- The data is old. A badge reflects what Apollo knew when it last checked. People leave jobs every week, and their old mailbox closes.
- Catch-all domains. Apollo argues that independent verifiers are too strict with catch-alls and treats many of them as fine. Their servers accept every address, so nothing can confirm the person exists. In Hunter's test, catch-all addresses bounced 27% of the time versus 1% for valid ones.
- Security gateways. Some corporate gateways accept mail at first and reject it later, which looks like a catch-all from outside.
- Long sequences. A list that was clean on step 1 can bounce more by step 4, weeks later.
- Only part of the export is verified. Mixing in Unverified or Likely-to-engage rows raises the rate.
What cold emailers report
This is one of the most common complaints on r/coldemail. A few examples, paraphrased:
- One sender found that more than 1 in 10 Apollo addresses marked verified turned out to be invalid, and resented having to pay for a second verification tool (thread).
- Another ran an Apollo "verified" list through a separate verifier and got roughly a fifth valid, a fifth invalid and the rest catch-all (thread).
- A user on r/Emailmarketing said NeverBounce routinely removes 30-50% of what they pull from Apollo, all of it already marked verified (thread).
- Another relied only on the Verified badge and still hit bounces and spam blocks at just 20 emails a day (thread).
These are individual reports, not a controlled study, and results depend heavily on the industry and filters you pull. But the pattern is consistent.
Apollo's refund only covers Apollo sends
Apollo refunds the credit when a verified email bounces within 30 days, but only when it was sent from inside Apollo (Apollo data requests, checked 2026-10-17). Most cold emailers export to Instantly, Smartlead or lemlist, so the bounce, and the reputation damage, is theirs to absorb.
Apollo has also made waterfall enrichment the default since December 2025, using 20+ providers, and claims it means 45% fewer bounces (Apollo waterfall). That's Apollo's own claim. Verify the export anyway.
The fix: re-verify every export
- In Apollo, filter to Verified and export the CSV.
- Upload it to MailExchange. Your Apollo columns (name, title, company, LinkedIn) come back with the results.
- Keep deliverable. Remove undeliverable and disposable.
- Move risky: catch-all rows into a separate campaign on established inboxes, or skip them on new domains. See should you send to catch-all emails?
- Import the clean file into Instantly, Smartlead or your sequencer.
Unknowns are refunded, and credits never expire, so you can verify each export as you pull it. Check the cost against your plan with the cost calculator or see pricing.