I have an internal mail server and would like to block all outgoing smtp traffic from other hosts.
Under the smtp settings 'Allow relay from', I currently have eth0 (network).
Problem is that all internal hosts can send smtp.
When I select the name of my mail server and remove eth0, no mail goes out.
I really need to block al other traffic as our IP got blocked by spamhaus because of a virus ...
What am I doing wrong?
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