> I thought about doing it that way, but I read that there was a
> limit: "Each delivery rule is limited to 5000 characters."
Yes, there is. I was simply waiting to see if that meant it wouldn't
meet with your reqs for all users. :)
> If a school has approximately 500-1000 students, with roughly
> 1000-2000 parents... a school administrator would need a filter rule
> that was in the neighborhood of 40,000 characters (~25 char per
> email address), teachers would need about 150 contacts for students
> and around 300 contacts for their parents (~10,000 characters).
Okay, that's a lot of preprocessing. What you should do for those
high-filter users is make them go through a custom Program Alias that
then reroutes the "pass" messages to a hard-to-guess real mailbox
name, and reroutes the "fail" messages to a subarea like
<realmailboxname>-fail, which could be running InfoManager to send
back an informative bounce ("You have not forged an allowed address.
Please hack again." :)
For the PA, you can use VBScript to start, then move to some compiled
language if necessary. For speed, you could be quite strict and only
look in the first xxx lines for a From: header before failing the
message unconditionally.
-Sandy
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