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  1. #1
    Join Date
    Jun 2011

    Incoming mails filter


    It's possible to filter incoming mails in server using iptalbes ?! . I want to filter incoming mails based on senders subnets. For exp. : From nslookup i find the ip address of sender domain address, so, how can I block all incoming emails from this IP address using iptables ?

    Best regards,

  2. #2
    Join Date
    May 2017

    Re: Incoming mails filter

    Following iptable rule will block incoming SMTP Mail from host/IP xx.xx.xx.xx:

    sudo iptables -A INPUT -s xx.xx.xx.xx -p tcp --dport 25 -j REJECT

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