"Stale" SMTP sessions

cfdynamics
Posts: 99
Joined: Mon May 24, 2010 2:27 pm

"Stale" SMTP sessions

Postby cfdynamics » Fri Jan 19, 2018 9:06 pm

For the past couple weeks have seen a big increase in connections from China IPs that appear to be making a connection and not actually doing anything. They are just using up a session and hanging on for quite a while. Is there a setting somewhere that I am missing that would drop these connections after waiting a certain amount of time for a command to come through?

twun
Posts: 16
Joined: Tue Dec 16, 2014 6:42 pm

Re: "Stale" SMTP sessions

Postby twun » Thu Jan 25, 2018 3:32 pm

I just created a windows firewall block, which blocks China, Russia and a few other top spamming countries. This really helped performance and unwanted spam.

Brett Rowbotham
Posts: 506
Joined: Mon Nov 03, 2003 7:48 am
Location: Cape Town

Re: "Stale" SMTP sessions

Postby Brett Rowbotham » Fri Jan 26, 2018 4:46 am

I added a DNS blacklist for cn.countries.nerd.dk which is blocking quite a few Chinese connections.

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