[exim] Exim as a filtering appliance

Exim users,
I'm embarking on a project to use Exim as part of an outbound scanning
host for clients. I'm hung up on whether or not Exim is well suited
for this task, or if we should look at another mail server.
The goal of this project is to have clients use us as their outbound
relay/smarthost. Mail coming into our system from their IP
range/domain name will have to stay on our system, delivering to local
mailbox files and/or maildir folders.
A program will then come by later on, scan said mail for text
qualities (not necessarily spam), and if the mail is good, will then
complete the next stage of delivery to the recipient.
In essence, I want Exim to be a caching relay. Take in all mail for
specified hosts, hold onto it for processing, and deliver when the
processing is finished.
We likely won't be doing processing as messages come through, but
rather using scheduled jobs to check mail via IMAP or equivalent, and
then send off the e-mail.
I've used Exim for other unorthodox tasks, but this one presents
larger challenges in my opinion, and just not sure if Exim is right
for this specific task.
Has anyone used Exim in this fashion, or have any thoughts on this?

Thanks!


Brent Jones
brent@???




----------------------------------------------------------------
This message was sent using IMP, the Internet Messaging Program.