Xenforo does not send Email

Hi,

It seems that the Emails are not being sent from my forum.
Any idea why? It is my own Email, so it exists...

• Swift_TransportException: Email to xxx@gmail.com failed: Expected response code 354 but got code "554", with message "554 5.5.1 Error: no valid recipients "
• src/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Transport/AbstractSmtpTransport.php:459

Click to expand...

Thanks

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