[Dovecot] LMTP don't accept jobs for system users

[Timo Sirainen]

On Wed, 2010-09-29 at 10:13 -0300, Alejandro Maurich wrote:
> Hi, I'm trying to configure Dovecot 2.0.1 to deliver email to users in
> /etc/passwd using the Dovecot LMTP service. So far, I can
> sucessufully do POP3 for system users, but when Postfix tries to deliver
> email to the Dovecot LMTP service the LMTP reject the job with:
> 
> "User doesn't exist ale at centos54.mydomain.com"

The problem is that Postfix appends the @domain, which isn't a valid
username. You could tell Dovecot to ignore the domain:

auth_username_format = %Ln