Over on the T-Mobile forums, there's a massive thread about the G1's totally borked POP3/IMAP email service. Looks like receiving, sending, and even just checking email results in a nasty connection error for just about everyone (one user estimates 95%). A T-Mobile representative posted in the thread, and while it looks like they're actively working on the problem, there doesn't seem to be a fix yet

http://gizmodo.com/5068743/t+mobile-...-email-is-down