[Mailman-Developers] Enhancing the bounce log

[A.M. Kuchling]

I'd like to produce improved bounce statistics from Mailman's logs;
for example, I'd like to track, per message, how many recipients there
were and how many of them bounced.  

This means the logs need to include the message ID. Most of Mailman's
logs (smtp, post, vette) include the ID, but the critical missing
piece is the bounce log.  To close the loop, I'l need to extract the
ID of the message that was bounced.  (The message ID of the bounce
message itself isn't useful, and may not even exist; qmail's bounces
apparently don't have IDs.)

How should I write the code to extract the ID?  Looking through the
bounce test messages, there are various formats so we'll need several
functions, similar to how there are several bounced-address parsers in
Mailman.Bouncers.  Should I:

1) add a extract_message_id() function to all of the modules in
   Mailman.Bouncers, which currently just have a process() function?

2) have a new package, Mailman.Bouncers.MessageId or whatever, that has 
   several modules, analogous to the existing bounce analysis?

3) have a bunch of analysis functions in one module, and a single master
   function that tries all of them?

I think 3) is the simplest course, but not too simple to be workable.
Looking at the test bounces, finding the message ID is much simpler
than finding the bounce address; searching for a small number of
strings such as 'Original message follows' will often find the
original headers.  Can anyone see a reason that the more complicated
1) or 2) would be necessary?

(I'll start a branch for this too, aimed at getting the change into
2.2.)

--amk