not encrypted but secure e-mail
 

There is a product, for example, called certified mail that runs on windows that gives access to secure e-mail. the e-mail is not encrypted (pgp, gpg) but stored on a secure SSL server. Is there a product or way to do this with linux? It would have to work with exchange. Any ideas on a way to accomplish this with a linux solution? Below is url to certified mail Thanks in advance

http://www.certifiedmail.com/products/cms/default.aspx

I'm not sure how this would be different from ssh-ing and running your favorite mail program.

My assumption would be that if you ran a web-based mail server that you could program it in such a way to only run over SSL. I think SSL is independent from the mail program so you might only need to specify the program to only accept https requests.

not sure how to do this...but hopefully this will give you a place to start.