[lgl]

While I agree that roundcube is really basic when compared with Gmail, I'd say that if you follow the convention that Gmail is nothing more than a webmail client (i.e.: a place you access through a browser to receive, read and send emails) then roundcube is exactly that. No bells or whistles though.

[PeterisP]

Gmail isn't just a webmail client - filtering out spam is a major part of any mail service; a mail server that doesn't reliably throw out the appropriate 80% of my incoming email messages simply is not usable.

I could run a mail server myself, but I don't believe that I can achieve comparable levels of spam filtering without excessive effort, so I would need someone else to provide this service.