On 02/11/2014 09:00 AM, A.L.E.C wrote:

One thing to consider. It is possible to forward many messages in one message. Should References and In-Reply-To be set in such a case? If so, to what values?

I see Thunderbird puts all forwarded messages IDs in References, but (only) one in In-Reply-To. That might be not what we want, but what's the intended behaviour here I'm not sure.

I'm moving the discussion from the users list. It is about http://trac.roundcube.net/ticket/1489593. Any suggestions to the above?