Verify Apollo emails before you export them.
Apollo.io has an incredible prospect database. But databases decay. InboxCheck adds a verify button directly on the Apollo page so you can confirm every email is deliverable before you spend an export credit.
Install free Chrome extensionWhy you should verify Apollo emails before sending
Short answer: Apollo maintains over 275 million contacts in their database. That scale is a massive advantage for prospecting, but it also means data ages at a significant rate. People leave companies, departments get reorganized, and email domains change. An email that was valid when Apollo scraped it may be dead by the time you send your campaign.
In our 2026 Data Decay Audit, we tested 1,000 emails sourced from Apollo.io. The combined invalid and risky rate was 14.2%. That means for every 100 emails you export from Apollo and send without verification, roughly 14 could bounce or go to catch-all black holes.
With InboxCheck running in your browser, you verify each email at the moment you review the prospect. Only Safe emails make it into your export list. Your Apollo credits go further, and your outbound campaigns start clean.
Apollo email accuracy (our 2026 audit)
Verify on Apollo in four steps
Install InboxCheck
Add the Chrome extension from the Web Store. Sign up with Google in under 30 seconds.
Open Apollo.io
Search for prospects using Apollo's filters. When Apollo reveals an email, InboxCheck is ready.
Verify before exporting
Click the verify button next to each email. Only export contacts that come back Safe.
Send with zero bounce risk
Your exported list is pre-verified. Your cold email campaign runs clean from the start.
The Apollo credit math
Apollo allocates a fixed number of email credits per month depending on your plan. Each time you reveal a contact's email address, it costs a credit. If that email turns out to be invalid and bounces, you have wasted both the Apollo credit and damaged your sender reputation.
The math is simple: at a 14.2% combined failure rate, a team exporting 500 emails per month from Apollo is wasting roughly 71 credits on addresses that will never receive a message. Over a year, that is 852 wasted credits.
By adding InboxCheck to your workflow, you can verify each email before deciding whether to export it. This turns Apollo from a "reveal and hope" workflow into a "verify then export" workflow. Your credit efficiency improves, your bounce rate drops to near zero, and your Gmail sender reputation stays healthy.
Frequently asked questions
How do I verify Apollo.io emails without exporting a CSV?+
Install the InboxCheck Chrome extension and browse Apollo.io normally. When you view a prospect's contact details, InboxCheck detects the email address on the page and adds a verify button next to it. Click the button to run a full SMTP verification in under two seconds. You never need to export, upload, or leave the Apollo interface.
Are Apollo.io email addresses accurate?+
Apollo maintains one of the largest B2B contact databases available, but no database is perfect. In our 2026 Data Decay Audit, we found a 14.2% combined invalid and risky rate for Apollo-sourced emails. People change jobs, companies restructure domains, and mailboxes get deactivated. The only way to confirm an Apollo email is currently valid is to verify it before sending.
Does InboxCheck work on Apollo's search results page?+
Yes. InboxCheck scans any visible content on any webpage. When Apollo reveals a contact's email address in search results, the people list, or the individual profile page, InboxCheck adds a verify button next to it. You can verify contacts one at a time as you research them, without needing to open each profile individually.
Can I save Apollo export credits by verifying first?+
Absolutely. Apollo charges credits for email reveals. If you verify an address with InboxCheck before adding it to your export list, you avoid wasting Apollo credits on invalid contacts. Verify first, export only the Safe results, and your Apollo credits go further.
What does InboxCheck check that Apollo's built-in verification does not?+
Apollo shows confidence scores based on their internal data matching algorithms. InboxCheck performs a live SMTP handshake against the recipient mail server at the moment you click verify. This means InboxCheck catches recently deactivated mailboxes, detects catch-all domains, and identifies disposable email addresses that may have valid-looking confidence scores in Apollo's database.