问题
Is there a way to aid gmail in making threads? We are currently using same Subjects to do this, but that really uglyfies the subject a lot.
回答1:
There are a couple of mail headers that other mail clients use to help threading - not sure if gmail supports them. The first is the standard RFC-822 "In-Reply-To: <messageid>", and the second is the non-standard (stolen from Usenet) "References: <messageid>,<messageid>,...".
来源：https://stackoverflow.com/questions/372449/header-in-gmail-for-thread-hinting