Gmail offers free POPs | CNET News.com
Google on Wednesday threw another bone to customers of Gmail, its free Web-based e-mail service. The Mountain View, Calif.-based company now allows people to download e-mail from any third-party account or forward their Gmail for free, or what's called POP (Post Office Protocol) access.
Gmail が POP3 も提供。Gmail のツールの特性を考えると POP3 より IMAP を提供してくれたほうが利便性は高そうですが。gmailproxy では POP3/IMAP/SMTP のプロキシを開発してるみたいです。