3 ms·What do you mean with mail header hacks?by vincentkriek 13y agoWhat do you mean with mail header hacks?justinmk 13y agoMail headers and mail relays are notoriously inconsistent. http://www.jwz.org/doc/threading.html http://www.jwz.org/doc/threading.htmleitland 13y agoThanks for posting the link!