[Mailman-Developers] RE: Listserv Maximum

Fil fil at rezo.net
Sun Jan 19 12:06:36 EST 2003

>     ts> Is there a listserv maximum number?
> I don't understand the question.  Is there a maximum number of what?
> lists?  members per list?  postings per list?
> There are no artificial limits on any of these.  There may be
> effective limits based on your system and network resources.

The first limit you hit when sending to a big list with many old addresses
(in my case, a list that was never properly cleaned, for lack of software
able to clean it nicely as MM does now : ~150K subscribers, ~40K bounces) is
the BounceRunner sucking up all your processing power and locking up the

You can imagine that bounce processing is something that doesn't really need
to happen in *real time*, ie when the server is sollicited by sending the
mail. However, if you just collect the bounces and wait before processing
them, you end up with high disk space requirements.

So I'd suggest, that we shoud 

1) pre-process bounces without accessing the list db : for each bounce, read
   the message, extract (when possible) the email address and list name, and
   write the email address into a listname-bounces.db ; then discard the

2) when the mail server seems to get colder (the latest lock on it is older
   than one or two minutes, or any other activity indicator), load the list
   (w/o locking) and calculate the bounce scores of the bouncers you have
   seen, and so on. Then only lock-load it, write the changes, and save.

I'm also thinking:

- should we/how could we do the preprocessing on another machine?
- could Mailman order its send queue by putting the non-bouncers first, thus
  shortening the delivery time for non-bouncers and enhancing the system

-- Fil

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