[Mimedefang] Auto Responders and SPAM

[David Benigni]

I'm not sure if this is the right forum or not.

I have been bitten twice by SPAM email forging addresses, someone
vacation rule send a message to a rbl trap account and my servers get
black listed.

Other than disabling rules like this, has anyone some up with a way to
reduce this?  I was think of using MIMEDefang to do this, but I wanted
to get community feedback first.

TIA,
Dave