SMTP error 252
Cannot verify recipient, will attempt delivery.
Updated Jul 1, 2026
The short answer
Cannot verify recipient, will attempt delivery. Common cause: The server cannot confirm the address exists but will try anyway.
Quick fix
Usually fine — watch for a later bounce if the address turns out to be bad.
2 - Success. Not an error - the server accepted or completed the action.
How to fix it
Usually fine — watch for a later bounce if the address turns out to be bad.