Handling email bounces

[drew at drewtaylor.com (Drew Taylor)]

We send automated emails via a web-based back-office application and 
would like a better way to handle bounced emails. Originally we had the 
simple To:, From: headers with the From: being set to the person who 
sent the email. Recently we changed the From: address to be an alias 
that I'm copied on. But that breaks the old behavior of allowing the 
recipient to reply to the original person.

So now I'm looking for the "right" way to do it. Is there something like 
an X-Bounce: header I can add, or is there another recommended way? I'm 
about to dive into the SMTP RFC but pointers are appreciated.

Drew
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Drew Taylor          *  Web app development & consulting
drew at drewtaylor.com  *  Site implementation & hosting
www.drewtaylor.com   *  perl/mod_perl/DBI/mysql/postgres
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