Ban an IP address from send mail to my server

Hi I would like to create a global rule to ban an IP address (or domain) from sending mail or trying to connect to my server.
How would I do this.
Kind Regards
Barry

 

looks annoying, I'd probably just firewall that IP completely by using something like
$iptables -A INPUT -s 169.0.88.65 -j DROP

 

Hi thanks for prompt reply .....
Where will I do this ..... Kind Regards

 

You can enter that on terminal, it won't survive a reboot.
See also https://wiki.debian.org/iptables

 

You could save the iptables rules by cron every xx hour or something or once a day:
Save the rules:

Code:

iptables-save > /root/iptables.rules

Upon reboot restore them:

Code:

iptables-restore < /root/iptables.rules