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Error: "The recipient firstname.lastname@example.org has been denied by the server because relay isn't authorized"
If you get this error message, in particular with an iPhone, you need to verify that you have entered a username and password in your iPhone SMTP server setup.
Actions to be carried out
Go to Settings -> Mail, Contacts, Calendar
Then, go to the SMTP settings of the email address that is causing a problem
If you find it difficult to configure your email address, don't hesitate to follow our guide (click here).