More and better logging

[Tom Sommer]

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