[Mailman-Users] Mailman reusing message-id, leads to duplicate message suppression

[Stephen J. Turnbull]

Ralf Hildebrandt writes:

 > Strictly speaking, all that womand wanted was to know if the message
 > passed both mailing lists... So she should have more faith :)

For lists hosted by the same Mailman, Mailman 3 might be able to
handle this by adding *both* List-Ids to the header, and only adding
the (other) RFC 2369 headers for the list(s) the user is subscribed
to.  Of course this requires personalization, but that seems to be
less and less a problem these days.

If that solution is interesting to anybody, please let me know, and
I'll check the relevant RFCs to see if multiple values are permissible
for List-* headers (and for which ones).  Code of course will depend
on Barry's permission, but I suppose he wouldn't object to providing
it as an option.

Also of course, it's only a partial solution, as separate Mailman
installations won't be able to coordinate.