Mail forwarded on the server in the target mailbox is delivered to the SPAM folder

Introduction:
I frequently use a mailbox with several alias names and then sometimes have it forwarded to a mail address of another domain on the same Plesk server.
I also use this permanently for other domains. So far everything has been fine.

Now I register a circumstance: Messages from the Plesk forum, which are delivered to plesk@domain1.tld ( an alias to info@domain1.tld ) are also forwarded to user@domain2.tld in the mail setup.
In the roundcube of...

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