As Emacs user I always want to use Emacs interface to edit documents. When I write e-mails, I also do, so I tried to introduce notmuch , emacs and offlineimap . As a result I feel notmuch on emacs is very useful in terms of tagging, searching, and emacs interface.

Some configurations below were not on the web, so I note here. If you follow my way to handle e-mails, this may help you.