A client is running NAT on a Linux box for his bandwidth customers. Now he needs to be able to catch spam and virus e-mails at the NAT gateway itself. Is there any way to transparently redirect outgoing SMTP into a local Sendmail (preferred) or other mail server for the Milter-type stuff?
Your best way to go would be to block port 25 outbound entirely except through your smarthost.
People who want to send mail out through other hosts can use port 587 (the rfc well known msa port) or an ssh tunnel
srs
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