Would it be possible to set up a server which accepts emails which it
then saves in a central database?

A user could then visit its website, select a message from a list, and
recieve it as an email.

This way, it would be easy for people to trade game saves using just a
Dreamcast, as the GameMail software that is part of the European web
stuff built into some games (Sonic Adventure and Rayman2 are two that
I know of) allows you to send and recieve attachments (i.e. game
saves)

It would probably also be handy to have the server scan incomming
mails to check that they do actually contain attachments (and that the
attachments are sega files) - which reminds me, what's the X-Mailer
tag for the GameMail stuff?

Also an option for people to rank saves that they've downloaded would
also be nice (i.e. 0..10)