There  is  absolutely  no reason for your server (I am speaking of the
SMTPD  service)  to  accept  mail  for  unknown  users unless you have
deliberately  enabled  such  a feature with good cause. This "all of a
sudden"  quirk  in turn creates several spam-related issues and should
be tracked down.

I haven't deliberately done anything to enable this, however, I believe
that I have misrepresnted my setup, not intentionally though. I
mentioned I had been posting to another list concerning this issue and
it was brought to my attention that a gateway would cause this behavior.
In my mind, that meant a server, set up as an IMAIL gateway, however,
the smtp proxy on my firewall *is* acting as a gateway of sorts, as it
intercepts all incoming and outgoing mail and sends it on it's way.
Except, I do think I mentioned the proxy on this list. 


Have  you  tried  testing  this  via  Telnet  from an internal address
(circumventing  your  firewall's  surely somewhat-broken SMTP filter)?
Can  you duplicate the same behavior with a dummy domain (set up a new
one just for testing)?

Testing via telnet is a good idea and I will surely do this, however I
would bet the results are that IMAIL acts the way it's supposed to
without the interference of the firewall's proxy. 

Len has been blasting my firewall for years now, I'm expecting to hear
his 2cents any minute :)

Sharyn


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