Are you sure? Because, IIRC, IMAP access must be explicitly enabled by going to Settings -> Forwarding and POP/IMAP -> IMAP access: (o) Enable IMAP. And I thin

Are you sure? Because, IIRC, IMAP access must be explicitly enabled by going to Settings -> Forwarding and POP/IMAP -> IMAP access: (o) Enable IMAP. And I think it is not enabled by default.