Administrators • Emails to zimbra@serverfqdn

Hello,
I have noticed I am getting multiple (even 2000 per day) log information regarding sending emails to a non-existing zimbra@serverfqdn email address.
Here examples:
Feb 16 13:43:05 mail postfix/cleanup[541069]: 4F3A2120B0C: milter-reject: END-OF-MESSAGE from localhost[127.0.0.1]: 4.7.1 Service unavailable - try again later; from=<> to=<zimbra@serverfqdn> proto=ESMTP helo=<localhost>
Feb 16 13:43:05 mail postfix/smtp[541063]: E98BB120AF0: to=<zimbra@servefqdn>, relay=127.0.0.1[127.0.0.1]:10026, delay=96944, delays=96943/0.03/0.01/0.43, dsn=4.7.1, status=deferred (host 127.0.0.1[127.0.0.1] said: 451 4.7.1 id=4186239-11 - Temporary MTA failure on relaying, from MTA(smtp:[127.0.0.1]:10030): 451 4.7.1 Service unavailable - try again later (in reply to end of DATA command))
Feb 16 13:43:05 mail amavis[4186239]: (4186239-11) ESMTP [127.0.0.1]:10026 /opt/zimbra/data/amavisd/tmp/amavis-20240216T004627-4186239-soYrqdB5: <> -> <zimbra@serverfqdn> Received: from serverfqdn ([127.0.0.1]) by localhost (serverfqdn [127.0.0.1]) (amavis, port 10026) with ESMTP for <zimbra@serverfqdn>; Fri, 16 Feb 2024 13:43:05 +0100 (CET)

The log file mailbox.log grows up to 300-500 MB
And I need help on that as I do not know how to find what is sending it. I assume this is sent from the zimbra server itself.
Thank you in advance for help.

Statistics: Posted by Kordian — Fri Feb 16, 2024 1:49 pm

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