I know that, in terms of UI, this is not precisely the SublimeText equivalent of an email client but have you taken a look at notmuch[0]? It basically operates

I know that, in terms of UI, this is not precisely the SublimeText equivalent of an email client but have you taken a look at notmuch[0]? It basically operates on your local Maildir which you can keep in sync with your mail server by using a tool like OfflineIMAP[1]. [0] https://notmuchmail.org/ https://notmuchmail.org/ [1] http://www.offlineimap.org/ http://www.offlineimap.org/