[clug] Webmail wanted

[Michael Still]

Hello.

Does anyone have a recommendation for a webmail client? I am after the
following features:
 - ability to handle many mboxes all at once
 - secure (hopefully)
 - open source
 - writes sent mail to a configurable location
 - records in the mboxes what has been read / answered in a way that Pine
 will understand - light on graphics and extraneous junk

I've googled, and it seems every man and is dog has written a bad web mail
client, hence my request for recommendations.
Mikal