[Dovecot] doveadm mailbox create error codes

[Micah Anderson]

Hello,

I'm trying to find out what the different 'doveadm mailbox create' error
codes are. I've been looking through the source, but I can't seem to
find them.

I did determine that '65' happens when "Error: Can't create mailbox x:
Mailbox already exists", but I've also received error 67, and the more
mysterious error code 16640.

Thanks for any pointers!
micah