14 Sep
2016
14 Sep
'16
3:41 p.m.
How is sending a new email any different than replying
/ changing subject
line?
A brand-new (not reply) message does not carry the References: header
chain from the previous thread. For threading-aware MUAs, this makes sure
the new conversation doesn't get buried in the old thread. Or possibly
even ignored, as some MUAs can kill/ignore portions of threads based on
specific message-ids in the References header.
--lyndon