501 5.5.4 Vous n'êtes pas autorisé à envoyer depuis cette adresse

The error message means the sender address is not allowed. Maybe because it does not appear in the mail server’s allowed senders configuration.

Huh, I found my error, thanks to your input, @pfaffman.

The ‘address’ in the error message relates to the sender address. I was focused on the IP address, so I was misled.

Once I checked the notification address (DISCOURSE_NOTIFICATION_EMAIL in the containers/app.yml), I realized my mail server was missing an entry for that sender: adding the alias solved the issue.

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