I know it has been asked for before and said to be "impossible" (programmer
speak, for don't want to do it -- I know, being one), but PLEASE consider
creating multiple copies of messages that arrive for multiple recipients, so
that the spam filters can operate (yes, this means some complications, but a
little trickery could reduce problems -- for example, only making a copy for
the recipient(s) that are whitelisted).

Technically, it is possible.


However, imagine a server that normally processes 100,000 E-mails per day. Let's say that 50% of that is spam, and each spam has an average of 5 recipients. Now, instead of processing 100,000 E-mails per day, you're going to be processing over 300,000 E-mails/day. At an average of 10 recipients (which is very common on some domains that have been around a while), that would then be over 500,000 E-mails/day. So you're talking about more than doubling resource usage in these cases.

Worse, one spammer sending a single E-mail to 50 recipients would cause IMail to use up all its allotted SMTP32.exe processes (pre-IMail v8), causing legitimate E-mail to get backed up. If a legitimate user sends out E-mail to a non-IMail mailing list (one they run), it could get magnified from say 10 E-mails of 100 users each to 1,000 separate E-mails that would clog up the spool until they could be delivered.

So while it is possible, there are serious ramifications.

-Scott
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Declude JunkMail: The advanced anti-spam solution for IMail mailservers.
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