[Dovecot] authentication failure with known good credentials???

[Timo Sirainen]

On Sat, 2010-08-14 at 20:46 -0700, Dave Stevens wrote:

>   I have a problem on my server. To illustrate, I created a new user,  
> unclewiggly, and set up a password. I then used sent an email from my  
> usual account. Logging in with my browser I am able to see the inbox,  
> the mail and contents correctly. I then set up a new instance of  
> Eudora 7.1 on my windows 7 box with the appropriate login id and check  
> the account using the correct password. The fetch fails with the  
> client reporting an authentication failure.

Set auth_debug_passwords=yes and look at the log.