Don't have mine yet, but the leaked manual says you can use a POP3 or IMAP server. Now POP3 is actually how the data is stored, not actually transmitted. SMTP is the transmission protocol used. Without it, you can't read/write to your POP3 server. So reading between the lines, it should all just work fine.
I'm planning on accessing a POP3 server as well as my gmail account.