Local Relay patch for MS

[Lindsay Snider]

Julian and fellow Mailscanneriers,
  Here is a patch which allows MailScanner to ignore ips acting as
relays to your mailscanner server.  For example, if you collect mail on
a mx server and then relay it to a mailscanner server, you can specify
your mx server as a local relay.  Then, mailscanner will not report the
mx server as the source of the message but rather the ip which connected
to the mx.

example:
sender-> localrelay1 -> localrelay2 -> mailscanner
mailscanner will report the sender's ip.

if this happens:
localrelay1 -> localrealy2 -> mailscanner
mailscanner will report localrelay1

Would anyone else find this useful?


Patch Detail:
For now only postfix support is coded.

I left debugging in so you can watch what its doing.

I originally had the mailscanner.conf -> message object load in during
Message.pm:new() but from what I recall, it wasn't running before
<mta>.pm:ReadQF.  Perhaps it should be moved to Postfix.pm:new().


Something like the following will work for the conf file.
/etc/MailScanner/MailScanner.conf:
# Local Relay
Local Relay = 205.166.61.207 205.166.61.208 205.166.61.202
205.166.61.131 205.166.61.0/25 10.0.1.8/32

--
Lindsay Snider <lindsay at pa.net>
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