[Dovecot] disconnect after too many errors?

There are a couple of jerks that are tying to dictionary attack my email server, and one of the vectors is pop3/imap logins. Something I would like to do in dovecot, but can't seem to find, is the ability to disconnect after a certain number of errors. The vast majority of my users (i.e. me) don't hand-type POP3 or IMAP transactions, but when we do, we know how to spell things properly.

Does dovecot have this? A simiple look shows no.

-- I wouldn't mind dying -- it's that business of having to stay dead that scares the shit out of me. -- R. Geis