#3090: Mutt removes In-Reply-To header field Comment (by vinc17):
Replying to [comment:4 pdmef]: > IIRC In-Reply-To isn't supposed to contain only exactly some message-id but may also contain things like "message <message-id> sent by <user> on ...". That's why mutt needs a heuristic of exactly one @ symbol to locate the message-id. However, I don't know if clients really/still generate something like that and how common it is in mail archives. There are MUA's that still do such kind of things, and I still receive messages with: In-reply-to: <message-id> (message from <user> on <date>) AFAIK, that's Emacs that does this. Gnus also does this, with a slightly different format. Also, Mutt sometimes puts several message-id's in In-Reply-To (I think, when one replies to several messages at once). > A fix could be to avoid writing out In-Reply-To and use References instead which still gives the user the chance to manually adjust threads in the editor. That's a bad idea: some MUA's only understand the In-Reply-To header (but this is quite old, and I don't remember which ones -- perhaps Emacs, at least I can see that it doesn't generate a References header). -- Ticket URL: <http://dev.mutt.org/trac/ticket/3090#comment:5>
