Verify Apollo emails before
you sequence them
Cold outbound only works if the address behind it is real. Clearout connects directly to your Apollo account so every list gets checked before it ever enters a sequence - protecting the sender reputation your whole team depends on.
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The cost of sequencing bad data
One bad list can cost you a mailbox, not just a lead
Apollo makes it easy to build and launch outbound at volume - which also means it's easy to load an unverified list straight into a sequence. On cold outbound, that risk compounds fast: every hard bounce, spam complaint, or dead mailbox chips away at the sender reputation your whole team's deliverability depends on. That's exactly why teams validate email lists on Apollo before every send.
Hard bounces flag your domain
Mailbox providers throttle or block senders with high bounce rates - often across every mailbox on the domain, not just the one that sent it.
Catch-all addresses skew your metrics
A "reply" from a catch-all server isn't a real prospect - it just makes your open and reply rates look better than they are.
Spam traps are invisible until it's too late
They don't bounce. They just quietly report you, and the damage shows up as a reputation problem weeks later.
See it in action
Watch the Clearout + Apollo.io integration
The only native Apollo email verification integration built for outbound teams
A short walkthrough of connecting your Apollo account, pulling a list into Clearout, and exporting verified results straight back - no exports, no spreadsheets.
How it works
Verify without ever leaving Apollo
Connect once, then pull any list straight from your Apollo account - no exports, no spreadsheets passed between tools. It's Apollo email validation without the manual busywork.
Connect with your Apollo API key
Add your Apollo account name and API key (found under Settings → Integrations → API in Apollo) to link your account - a one-time setup. From there, you can validate emails on Apollo without ever leaving your dashboard.
Pull any list, no exports
Select an existing list from your Apollo account and add it to Clearout directly - the data never has to leave either tool manually.
Run the full validation engine
The same 20+ checks behind every Clearout product - catch-all resolution, disposable detection, spam trap flags, and syntax errors - giving you full Apollo email list verification in a single pass.
Export straight back to Apollo
Push verified results back to your Apollo list with Clearout's result columns appended - you'll get a confirmation email once the export completes.
Use cases
Where this fits into your outbound motion
The same connection, applied at whichever point your Apollo lists actually pick up risk.
Before loading a new sequence
Verify Apollo email list batches - purchased, scraped, or list-sourced - before they go into a sequence, so reps aren't burning steps on addresses that were never going to land.
Recurring checks on your core database
Verify email lists on Apollo on a recurring schedule, catching addresses that have gone stale or started bouncing since they were first added.
Validating enriched or waterfall-sourced emails
Run a verification pass on addresses sourced through Apollo's own enrichment before they feed an ABM or paid outreach campaign.
Validating client lists before outbound starts
Protect every client's sender domain by verifying their Apollo lists before you spin up outbound on their behalf - not after the first bounce report.
Data handling
What actually happens to your list
No surprises - here's exactly how Clearout validates Apollo email addresses and handles your data once it leaves Apollo.
Upload limit
CSV/XLSX uploads up to 2GB if you're not importing directly from Apollo.
Encrypted in transit & at rest
Every file and API call is protected end to end.
Auto-deleted after 30 days
Your lists aren't kept around indefinitely - they're purged automatically.
Never shared
Your data isn't sold, shared, or used to train external models.
80,000+ growing businesses rely on Clearout to verify emails on Apollo and beyond every day
Consistently Leading With Proven Excellence
Every list gets a Clearout pass before it goes into a sequence now. It's one extra step, but it's saved us from at least two domains getting flagged since we started - worth it just for that.
More from Clearout
Once leads move past outbound
Most Apollo teams eventually hand leads to a CRM - Clearout covers that too.
Protect the domain your whole team sends from
Connect your Apollo account, clean your Apollo email list, and verify your first send in a few minutes.
Connect Apollo Account