Strange Dovecot unmatched entries?

Strange Dovecot unmatched entries?

I’m getting a load of these kind of Dovecot entry’s in my logwatch:

Quote:

Dovecot: auth: passwd(sales@domain.nl,77.169.xxx.xxx,</qB1xrsfsBdeNxxx>): unknown user: 1 Time(s)


I changed the ip here and a bit of the code between the < > markers.

Where is this coming from? I’m also seeing this on my own email adresses with my own ip adress behind it. But my mail is getting fetched with Outlook.
So there is no unknown user, no unknown password, I never have flaws in my mail.
Is this some kind of Dovecot bug or where are all these "unmatched entries" caused by?

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