Thanks for your clear explanation. The thread-merging and breaking is in the procedure already pointed at by Jani: (_notmuch_database_link_message() in lib/database.cc.) Is there a quick way to recognize those git-threads by subject-syntax, or to reliably tag them to exclude them from subject-breaking? -----Oorspronkelijk bericht----- Van: Carl Worth [mailto:cworth@cworth.org] Verzonden: dinsdag 29 januari 2013 3:48 Aan: Robert Mast; 'Jani Nikula'; notmuch@notmuchmail.org Onderwerp: RE: Reply all - issue Is there any existing thread-breaking? There wasn't the last time I looked at the code closely, (but admittedly, that was a while ago). -Carl