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["Adam Bernstein" <address@concealed>]

Thanks, Olivier.  I now understand what the multipart/alternative type
means, and I've tested what Outlook does when one adds an attachment to
a HTML-formatted (multipart/alternative) message.  It does exactly what
you suggest below: a multipart/mixed wrapper, with the original multipart/
alternative message as the first part, and the attachment as the second.
So that seems like the right solution for Sympa to use too.  Will you be
implementing that, or should I just customize mine?

    adam

You wrote:

> Adding a footer to a multipart/alternative message implies one of the
> following for Sympa depending on the type of appending :
>       1/ adding a MIME part
>       Sympa should encapsulate the multipart/alternative within a 
> multipart/mixed
>       structure. Here is what it would look like :
>               multipart/mixed
>                       multipart/alternative
>                               text/plain
>                               text/html
>                       text/plain (footer)
>       We should first check that all MUA will cope with that...