send error in roundcube, postfix configuration (was: Configuration Problem)

[Henning]

Hi,

I cannot send no more emails through roundcubemail.

It can be resolved, commenting the smtp_data_restrictions in master.cf 
as in this old mail: 
http://lists.kolab.org/pipermail/users/2012-July/013520.html

Quote:
----------------------
After some config testing, I've narrowed it down to this line (when
commented out, emails go):

      -o smtpd_data_restrictions=$submission_data_restrictions

In main.cf:
submission_data_restrictions = check_policy_service
unix:private/submission_policy
----------------------

So I experience the same. What is the problem there?

Henning