Quoting Dieter Kirchner
Depends on mailer. For postfix I would say yes, don't know exim etc. so good.
Same thing, easy, examples are included. The docs and config-file all explain the lot As you are at it, check out amaia, (see sourceforge) you will like it. This one makes admin of spam and virus quarantine easy for admin and user.
Don't think so, guess they use a MTA which does not change any header. You can do a port redirect with iptables on port 25 on your scanning host, redirecting it into a MTA you configure to resend the stuff after scanning.
Hmm, well thinking about this it is rather easy. primary MX is the proxy so that's easy. And mail is used to being relayed (aka proxied) so maybe redirecting outgoing 25 to internal interface ip might just work. Much easier is to disallow forwarding of connections to port 25 and set internal mailers to use proxy/fw as the standard relay. BB, Arjen