Mail Delivery System

Hello guys, just recieve this message from Mail Delivery System Mailer-Daemon@HOSTNAME

This message was created automatically by mail delivery software.

A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es) failed:

0B59F2D47AC39A826D6F80CA8FD7CA48B42A394=.c98f.7f67.d@b7fca-48.gmx.de
Unrouteable address

what is it?

Please delete if topic is not relevant or no one know this is issue or not

Hi @osmaster,

Looks like a bounce mail.

Show the output of this command:

exigrep 'b7fca-48.gmx.de' /var/log/exim4/mainlog*
2024-06-14 13:19:40 1sI35w-005wp0-4c <= [email protected] H=(DB8P192MB0726.EURP192.PROD.OUTLOOK.COM) [0.0.0.0] P=esmtpsa X=TLS1.3:ECDHE_SECP256R1__RSA_PSS_RSAE_SHA256__AES_128_GCM:128 CV=no SNI="mail.hostadmin.com" A=dovecot_login:[email protected] S=1052 id=DB8P192MB0726DE2F9D689B70F835350DF8C22@DB8P192MB0726.EURP192.PROD.OUTLOOK.COM
2024-06-14 13:19:40 1sI35w-005wp0-4c ** 0b59f2d47ac39a826d6f80ca8fd7ca48b42a394=.c98f.7f67.d@b7fca-48.gmx.de <0B59F2D47AC39A826D6F80CA8FD7CA48B42A394=.c98f.7f67.d@b7fca-48.gmx.de>: Unrouteable address
2024-06-14 13:19:40 1sI35w-005wp0-4c Completed

What I see is [email protected] sending a mail to 0B59F2D47AC39A826D6F80CA8FD7CA48B42A394=.c98f.7f67.d@b7fca-48.gmx.de and mail server from gmx.de rejecting it because doesn’t exist in their side.

How or why it sent a mail to 0B59F2D47AC39A826D6F80CA8FD7CA48B42A394=.c98f.7f67.d@b7fca-48.gmx.de… I don’t know because that address looks like a bounce… maybe info account has a redirect/forward directive…

I didn’t touch anything, how else can I secure account?

It should be secure enough but if you think it could be compromised, change the password.

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Thank you @sahsanu !

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