Comment 9 for bug 65821

There was a change is mutt's handling of an IMAP "BAD" response. However, Etch's libsasl2 doesn't seem to recognize fastmail's OTP method, so it doesn't get a chance to hit the bug. Attached is a possible -proposed update for the bug, which fixes the behavior for me, and restores the prior intent of the mapping from IMAP_CMD_BAD => IMAP_AUTH_UNAVAIL which lets the sasl auth system end gracefully, at which point mutt fallback to other authenticators, such as "LOGIN".