Hi,
I look after a small company network where people have a habit of installing all sorts of rubbish on their PCs.
I have already configured the 501 to block all traffic on port 25 except to the IP address of the mail server. It is working fine, but the SPAM is still getting out somehow.
I'm not sure if the infected PCs are sending mail using other ports or are using the legitimate mail server - and I'm not really sure how to prevent it.
I could be much stricter with the individual PCs and educate the users, but was hoping that there is a more centralised way of stopping this stuff.
Any ideas?
Thanks