Guides library
Deliverability5 min readJuly 31, 2026
What Email Verification Can and Cannot Tell You
Use verification as a quality signal, not a guarantee.
Verification can identify malformed addresses, missing mail records, disposable domains, and some unavailable inboxes. Catch-all domains and protected mail systems may remain uncertain. A valid technical result does not guarantee delivery, attention, or permission.
Verify close to use, combine results with source quality, and suppress addresses that repeatedly bounce. Keep the original result and date so the team understands why a contact was included or excluded.
Apply this guidance to your business context and the rules that govern your recipients. Keep consent or legitimate-interest records, honor opt-outs, and minimize stored contact data.