[Mailman-Users] Ignoring duplicate messages?

[Paul Tomblin]

On Wed, Jan 09, 2002 at 04:43:11PM +0000, Melanie Dymond Harper wrote:
> I've got some users who hit "reply-to-all" and thus wind up with two
> copies of the message coming towards the list concerned. I realise that
> the best way round this is user education (!), but is there any code within
> Mailman which will spot duplicates and ignore them? It is duplicates with
> the same Message-ID with which I'm concerned.

Run the list mail through procmail before going to the list.  (I already
wrote up how to do that in the faq.)  In the procmail filter, put the
following code up near the top:

:0 Whc: msgid.lock
| formail -D 8192 /tmp/msgid.cache

:0 a:
/dev/null

The first bit keeps a message id cache of the last 8192 message ids
recieved on the list, and the second bit deletes any messages whose
message id matches one in the cache.


-- 
Paul Tomblin <ptomblin at xcski.com>, not speaking for anybody
Things should be as simple as possible, but not simpler.
                                             -- Albert Einstein