More and better logging

In general I feel there is a lack of debug and "when things go wrong"-logging in Dovecot (information that should perhaps be provided with a verbose toggle).

I was debugging problems with sasl user logins and a generic "SASL CRAM-MD5 authentication failed: Connection lost to authentication server" error in postfix, but nothing is logged in Dovecot when the error occurs.

After extensive debugging I finally discovered auth-penalty and auth_penalty_to_secs after digging in the code. I suspect this to be the cause, but truly I have no way of confirming this, since no log is provided when this is triggered? - it would be nicer if events such as these were simply logged for better debugging and troubleshooting.

Two cents :)

Thanks

Tom