to follow up on what Earl Hood said:
>
> > >Your MUA screws up the References: header field. It also
> > >does not include the message-ids of my messages.
> >
> > Yes, it did. Dunno how, it's a normal flavor of Eudora.
> > Hope this one is fine...
>
> Nope. What Eudora is doing is copying the first unfolded line of
> In-Reply-To field value of the message being replied to into the
> References field. Hence, if the message has other data in the
> In-Reply-To field with the message-id, then the References can get
> screwed up, and not even contain the referenced id. On top of that,
> References is not being used properly. It does not set References as
> defined by the RFC (cannot remember number) dealing with USENET
> postings (where References come from). The most recent referenced id
> should be added to the end of the References list, not the beginning.
RFC 1036
However, see also the current drafts of the NNTPEXT working group
in IETF, also the USEFOR group, and the work of Jacob Palme on
mail/news harmonization if not covered in those.
Al