This guide explains how to resolve the error “Recipient abc@domaine.xyz was rejected by the server, because relaying is not permitted,” which may occur if your email address is not configured correctly in your email software/client.

How to resolve the error?

From an Apple device (Mac, iPhone, iPad, etc.)

The easiest way is to delete the email account in question and then use the configuration tool to reinstall it.

Please refer to the official help to learn how to delete the email account on your Mac.

Then, reinstall your email using an Apple synchronization profile.

From any other software/email client

Refer to this other guide by following the instructions corresponding to the version closest to the one you have.