Wenn ich versuche eine Mail an eine bestimmte Adresse zu melden bekomme ich folgene "Fehlermeldung" in Form einer Mail zurück:

This is the mail delivery agent at Symantec Email Security.cloud.

I was unable to deliver your message to the following addresses:

[Email Adresse]

Reason: 550 5.1.1 < [Email Adresse]>: Recipient address rejected: User unknown in relay recipient table

The message subject was: [Betreff]

The message date was: Sun, 29 Dec 2019 17:45:06 +0100

The message identifier was: 11/46-17986-738D80E5

The message reference was: server-15.tower-288.messagelabs.com!1577637942!1209661!1

Please do not reply to this email as it is sent from an unattended mailbox.

Contact your email administrator if you need more information, or

instructions for resolving this issue.

Wie kann ich das beheben?