dovecot - Jul 2016 - dovecot master password without "auth_master_user_separator"

Looking at the doc its sugest we can either use auth_master_user_separator
 to login with a master user (i.e user at email.com*master and the master
password defined in a file or db)

I'm able to use this method with a password file and works just fine,
however we need to sync some imap users to another destrination that does
not allow us to use this format in the "email address source" (shame)

But the doc also sugests if I don't use this flag I should be able to just
use the same login used in the SASL mecahnisms which is not working
(testing with plain text ).
Is there anything more to this?

I have tried to add a username to the password file with the same master
password but still doens't work :|

What am I missing?

Melhores Cumprimentos // Best Regards
-----------------------------------------------
*Miguel Clara*
*IT - Sys Admin & Developer*