Commit 4ddab346 authored by Committed by Katsumi Yamaoka
gnus-int.el, nnimap.el, nnir.el: More improvements to thread-referral.
message.el (message-send-mail): Don't insert courtesy messages if the message already has List-Post and List-ID messages. gnus-ems.el (gnus-put-image): Use a blank text as the insertion string to avoid making the From headers syntactically invalid.
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