[Mailman-Users] Retention of Message-Id:

[Kevin McCann]

Hi there,

I am using a web forum to send messages to a gated Mailman list. I send a 
custom Message-Id: header and Mailman seems to retain that. In other words, 
when I receive the message in my inbox (I'm a member of the list), it has 
the same Message-Id: that was generated by the forum script. Which is great 
- I can achieve true threading in the forum using these IDs when processing 
email replies. When I send a message from a forum to a Lyris list, however, 
Lyris does not retain the Message-Id:, it replaces the one I sent with it's 
own.

Can someone tell me which behaviour is correct? Is the behaviour of Lyris 
contrary to an RFC stipulation? If so, can someone point me to which RFC 
and which rule? If they're not being RFC-compliant I'd like to bring it to 
their attention.Ideally, I'd like to gate my forums to any type of list - 
Mailman, Lyris, Yahoogroups. Majordomo, ezmlm, you name it. I just need to 
know whether I can *usually* depend on Message-Id: retention. If not, I 
guess I can create my own header like X-Msg-ID:, but I'd prefer not to.

Any advice?

Thanks,
Kevin McCann