>However, I'd like to if possible redirect messages that come in via SMTP
>on our IMail server that have not passed through Postini's servers to Postini.
That should never happen, if your MX records point to Postini. If you do
have MX records pointing directly to the IMail server, many spammers will
connect directly to IMail (they know that backup mailservers often don't
have spam protection, and not many spam programs will detect the spam if it
comes from a backup).
>All messages that pass through Postini get some "X-postinispam*" headers.
You could write a program to do that. But note that if for some reason
Postini changed the format of the header, you could cause an infinite loop
with all your E-mail (all incoming E-mail from Postini would no longer have
that header, so all of it would get sent back to Postini).
>I could write something, but I'm not at all familiar with the format of
>the queue control files.
It would likely require intercepting the SendName registry entry, which
involves a fair bit of work (such as file locking and starting a new SMTP
process). Rewriting the queue file would require not having the queue file
deleted even for a brief time, unless you have a way to make sure that
IMail didn't use any CPU time while the queue file was gone.
>I know I can insert a program into the delivery chain prior to SMTP32
>being called, but can that program modify the Qxxxxxxx.SMD file to
>instruct SMTP32 to relay the message to another host instead of delivering
>the message locally?
Not if it is a program alias, but the SendName hook will allow you to do
that -- but there's a lot of work involved.
The easiest way to solve this would probably be not to have your IMail
server listed in the MX record.
-Scott
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