"HANGUP after 0 in tests before SMTP handshake" Spam in Server Log

[NoobKeksTV]

Hello,

A few minutes ago my mailserver stopped working and i didn't received my xenforo messages wich are send using my mailcow server. I checked my Server Log and it Spammed something in the log as you can see in the screenshot: https://cdn.egopvp.com/nextcloud/index.php/s/ooXP8PgxXmmttXt/preview

What is happening there? Its doing this stuff for over 30minutes now and it doesn't stop doing it.

[NoobKeksTV]

Important to know is that 194.59.207.61 is my Server's IP Adress!

[andryyy]

Do you know this IP? If not, you should ban it. Check the mailcow UI, find the Fail2ban section.

Mit besten Grüßen André Peters

Am 16.04.2019 um 23:03 schrieb ZockerBoysHD notifications@github.com:

Hello,

A few minutes ago my mailserver stopped working and i didn't received my xenforo messages wich are send using my mailcow server. I checked my Server Log and it Spammed something in the log as you can see in the screenshot: https://cdn.egopvp.com/nextcloud/index.php/s/ooXP8PgxXmmttXt/preview

What is happening there? Its doing this stuff for over 30minutes now and it doesn't stop doing it.

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[andryyy]

Ok, then you should really check why your server is flooding your mailcow.

[NoobKeksTV]

I just realized that i have a Discord bot running which check some services of mine if theire online. (Ping) the timestamps would fit because the bot ping all the selected services every 10seconds... And after i stopped the bot the Spam stopped. silly me.... Sorry for any trouble! But thanks for the advice! Maybe it will become handy for me in the future.