[Dovecot] passwd-file - lower limit for username?

[Timo Sirainen]

On Tue, 2012-02-21 at 17:33 +0800, Oon-Ee Ng wrote:
> Hi, previously I could use the following in my passwd-file:-
> 
> AB:{plain}password
> 
> I'm not sure when it stopped working, its not an account I access with
> any regularity, but today it would not work (2.1.0, 64-bit Arch
> Linux), with an 'unknown user' error in the logs. Is there some new
> lower limit for username length?

Oh, I think it's because AB is uppercased. Either lowercase it "ab" or
set this to empty:

auth_username_format = 

I hadn't thought of this being a problem before.. Hm. Perhaps it's not a
common problem, so I'll just change the Upgrading text to mention this
possibility also..