The mailing list for listmasters using Sympa

[Aumont - Comite Reseaux des Universites <address@concealed>]

Dan Pritts wrote:

> On Tue, Jan 31, 2006 at 02:21:53PM +0100, Serge Aumont wrote:
>  
>
> > Removing the Message-Id: make message non conforment to RFC. From my 
> > knowledge, if you are using sendmail, it will add a new message-id. Not 
> > a very clean solution !!!
> >    
>
> Any MTA should add a message-id to a message it receives if there is not
> one already.
>
> It is arguable whether a MLM like sympa should keep the original
> message-id, or other characteristics of the message, or assign its own.
> Or perhaps there is an RFC on this that Serge is referring to that I'm
> not aware of, i presume Serge refers to RFC 822 and its successors.  
>  
The model for a mailing list server is either a forwarder or a remailer. 
A forwarder should not modifuy the original message if possible. The 
remailer is the original source for the message and it should create 
it's own message-id. We have a strong preference to say that Sympa is a 
forwarder (however it is also a remailer in many way such as sending 
message digest etc).

The second remark is that GMAIL decide to remove duplicated message and 
this filter is made using message-id. This is not not a bug but a 
feature and may be it should be repected. Anyway, you can decide to 
remove message-id if this is needed for you services.

Regards
Serge Aumont