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IP is not detected for this incident because there is no ip in corresponding dovecot message, so this is probably dovecot misconfiguration issue. Take a look at this thread https://www.dovecot.org/list/dovecot...er/138454.html
> This was similar to another complaint several months ago. I conjectured
> that these attempts are SMTP AUTH, not IMAP, brute forcing. Are you
> using the dovecots SASL feature to authenticate outgoing Email (i.e. via
> Postfix?). Maybe you verify this hypothesis by checking the Postfix logs.
Probably postfix tries to authenticate using dovecot SASL mechanism.
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