A lot of replies talking about mutt. Unfortunately I've never used mutt.
in reply to Re^2: Describe your Dream WebMail App
in thread Describe your Dream WebMail App
This is probably a bad sign for anyone who needs the kinds of features mutt sounds capable of.
I now realize that the kind of tools we as developers require are much different than the kinds of tools CRM application users typically need. There the focus tends to be on making things really simple so even the dimmest bulb can manage sending and receiving email.
I suppose I'll start out with the basics (send/receive email, folders, attachments, search) and work up to more interesting things (multiple identities and SMTP servers, JAMES-esque "Maillets" and programmable templates with mail-merge.
This thing won't be replacing mutt anytime soon :)