Hi There are 2 separate issues here. One is running an email service (SMTP outbound and IMAP inbound) and the other is providing a proprietary email application as 'Software as a Service.' Using GMail or YahooMail for SMTP+IMAP seems to me no different to using Dreamhost or the FSF's SMTP+IMAP service; but using Thunderbird or GMail's Web App seems different.
Cheers Dave
