> -----Original Message-----
> From: Bosco So
> I've already deployed a bounce handler mailet to catch 
> messages sent to the Return-Path (whose value is different from the From:
and 
> Reply-To: headers). The assumption is that any messages sent to the
address 
> specified in the Return-Path is a bounce (see PS below). I hope that's 
> an OK assumption. I also have a different mailet to handle the messages 
> sent to Reply-To: (which is VERPed with a different prefix).

I'm running the same kind of setup, including custom matchers and mailets to
record the status of individual emails in a database. I do not tinker with
the return path, but use different addresses in the envelope for the from
ande reply-to. I've seen some things that I did not expect, such as
out-of-office messages that are sent to the from address.

> PPS: Regarding categorizing bounces, I'm not doing that right now 
> (mainly due to lack of time). But I'm keeping my eyes peeled 
> for RegEx that'll help categorize bounces into some main categories. There
is 
> enough fodder here for a huge lively discussion.

I've made an attempt to do exactly the same thing, but I'm not happy with
the results so far. What I tried to do was to look for an SMTP status code
that indicates the persistence of the failure to deliver the message so I
can discriminate between transient and permanent failures. I'm using all the
text parts of a message to look for the SMTP status. My experience so far is
that a lot of bounces do not contain an SMTP status that can be used for
such purposes, but maybe I'm looking at the wrong things. 

--
Jeroen 

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