Markus,

Sunday, January 26, 2003 you wrote:
MG> Why PERCENT should be a sign for spam that recieve 50% of
MG> the hold action in your default config file?
MG> Have I missed something?

The  PERCENT  test  was  never  to catch spam as I recall.  IMAIL, and
other  mail servers for that matter, can be made to relay by sending a
piggybacked  %address  via  a  trusted backup server.  Since this
test  is  still used by many of the open relay testers then failing it
can  get  one blacklisted as an open relay.  Interestingly I have seen
only  one attempt by a spammer to use this method on our servers but I
see 2 or 3 open relay tests per month.

As  an example you might have 2 IMAIL servers backing up each other or
you  might  have a MS  SMTP  server  as  a backup MX in your list of
accepted  IP's  to an IMAIL server.  In either case it may be possible
to relay using the %piggyback address.


Terry Fritts

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