Email Verification

Disposable and invalid emails get caught automatically

Dec 2, 2025

When contacts are imported or subscribe to your list, we now check each email for validity. This catches disposable addresses, invalid inboxes, common typos, and non-existent domains before they damage your deliverability.

Invalid emails are flagged automatically. This keeps your list clean, reduces bounce rates, and protects your sender reputation without any extra work on your end.

Recent updates

Campaign scheduling

Feb 11, 2026](https://letterby.com/explore/campaign-scheduling)

Domain Warming

Dec 7, 2025](https://letterby.com/explore/domain-warming)

Zapier integration v2

Nov 26, 2025](https://letterby.com/explore/zapier-integration-v2)