Symfony TransportException: Email failed: Expected response code "250" but got code "451", with message "451", with message "451 4.4.2 Timeout

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Alpha1

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May 16, 2026
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I have loads of the following errors. I had these on the previous server and now on ultrafast server these keep coming. AWS SES sending rate limits have been royally increased, so its not that.

Symfony\Component\Mailer\Exception\TransportException: Email to [email protected] from [email protected] failed: Expected response code "250" but got code "451", with message "451 4.4.2 Timeout waiting for data from client.".