Currently mailutils movemail works with gmail imap using this:

movemail 'imaps://carlosjosepita%40gmail.com:XXXX@imap.gmail.com/INBOX'
RMAIL

but not this:

movemail --tls 'imap://carlosjosepita%40gmail.com:X
XXX@imap.gmail.com:993/INBOX' RMAIL

I wouldn't be difficult to support imaps in rmail, as it's just forwarding
the request to movemail, which already supports it. This way it would be
possible to use gmail imap in rmail.