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Question No such user in mail authorization database

Pamibo

New Pleskian
Hello,
what kind of message is this that I have now (more or less by chance) noticed.
It is in the / var / log / maillog of the mail server.
Always connected to an email address that appears to be a user in mine
Mail environment searches.

And it is always the same IP group that is listed
I'm not an email specialist now and don't really know how to fend off this.
Product Plesk Onyx
Version 17.8.11 Update # 88, last updated: July 28, 2020 02:09:45
Perhaps you can help me a little.
Thanks in advance.
Friendly greetings
 
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