I used this for a while approximately 15 years ago. It was excellent and while I was composing an email it would find things in my history that were useful to t

I used this for a while approximately 15 years ago. It was excellent and while I was composing an email it would find things in my history that were useful to the conversation. Alas, I can no longer do all email and web browsing in Emacs. I really wish such a thing existed for Mail.app in OS X.