[Dovecot] Dovecot auth user lookup patch for maildrop

[Timo Sirainen]

On Apr 25, 2009, at 6:20 PM, mr.maX wrote:

> +One significant difference compared to Courier Authlib extension is  
> that Dovecot +Authentication extension will never return uid/gid  
> that's equal to zero.

This isn't actually true always. gid=0 can be returned, although to  
get that working with imap/pop3 requires also setting  
first_valid_gid=0. uid=0 is never returned though.