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Postfix Spam mail script

Posted October 26, 2017 2.2k views
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Hi Everyone,

I need some help. I believe there is someone put a spam email script on my server, but I am not where that is. Need some help to figure out where it is.

Mail server: postfix
Server: Ubuntu HHVM Nginx

Any help would be appreciated!

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1 answer
narbeh November 5, 2017

Try to use tcpdump command to capture the traffic especially the mail server ports like 110 - 25 .... (depends on your service you provide) then analyze the captured traffic and block the inappropriate sources with iptables.

Examples of commands just to get started:

tcpdump -nty any port 25

Block the traffic from specific source

iptables -t filter -s 1.2.3.4 -j DROP
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