Apollo Email Verification

Apollo runs its own confidence scoring on email addresses as part of its data enrichment process. That scoring is a quality signal for Apollo's database, not a real-time SMTP check. Running a BillionVerify pass after export catches what Apollo's confidence score cannot — current deliverability, catch-all status, and addresses that changed after Apollo's last data update.

There is no threshold that eliminates the need for verification. Even 90%+ confidence addresses can include catch-all domains, stale records, and role-based inboxes that produce bounces. Use the confidence score as a pre-filter if you need to reduce list size, but always verify the resulting list before import.

Route them to a separate, lower-volume segment. Do not mix catch-all addresses with confirmed valid addresses in the same high-volume rotation. Some catch-all addresses will deliver; many will not. Separating them protects your main campaign's deliverability metrics and keeps performance data clean.

Yes. Any Apollo export older than 90 days should go through verification again before reuse. Addresses that were valid when you last used the list may have changed. Apollo does not automatically update your saved lists when contact data changes.

Export as CSV from Apollo. BillionVerify accepts CSV files with an email column. No special format is required — a standard Apollo contact export with the email field included is ready to verify without transformation.

Verify both. Business addresses go through the standard routing table. Personal addresses (Gmail, Outlook, Yahoo) should be flagged separately — they are not appropriate for B2B outbound in most campaigns, and including them in high-volume sequences can trigger spam filters more quickly than domain-matched business addresses.

It depends on list age, industry, and contact type. Recent exports from large, stable company domains tend to have higher valid rates. Lists with many SMB contacts, recent job changers, or catch-all-heavy industries (technology, startups, agencies) tend to have more catch-all and invalid results. Do not use an expected pass rate to decide whether to verify — verify every export regardless of anticipated quality.

Apollo does include an email verification feature in some plan tiers. It checks format, domain existence, and some deliverability signals. It does not perform the same SMTP-level check that BillionVerify runs at import time, and it does not classify catch-all, role-based, and unknown signals with the same granularity. For lists going into high-volume campaigns, running BillionVerify as a separate gate after Apollo reduces risk that Apollo's internal tool does not fully catch.