[Mimedefang] Security note: Open port 25 on internal mail servers

[Kevin A. McGrail]

> This is a note I sent to all our CanIt customers; I think it bears
> repeating for MIMEDefang users.
>
> Edited to replace "CanIt" with "MIMEDefang" :-)

Concur.  We have seen a heavy increase in this and have had to bear the
substantial brunt of simply filtering all mail inbound and outbound because
they were bypassing MX and going straight to A records.

Regards,
KAM