hi, Mike M:
If you need to stay with open source, my opinion is that you should choose an excellent open source MTA (I tend towards Postfix). Your requirement for searching the logs is incidental to your main concern - reliable email delivery.You can then solve the problem above with some simple scripting solutions.
Like$ grep [EMAIL PROTECTED] /var/log/maillog or the like. Really easy, especially for admins. I am not one, but even I managed to learn it :)
-- Zbigniew Szalbot www.LCWords.com
Description: S/MIME Cryptographic Signature