> Hi all,
> Is there a way to limit/restrict the usernames that are allowed to use 
> our postfix dovecot-sasl authenticated smtp relay?

In smtpd_client_restrictions, use check_sasl_access:

   check_sasl_access type:table
          Use  the remote SMTP client SASL user name as lookup key for the
          specified access(5) database. The lookup key has the form "user-
          name@domainname"   when  the  smtpd_sasl_local_domain  parameter
          value is non-empty.   Unlike  the  check_client_access  feature,
          check_sasl_access  does not perform matches of parent domains or
          IP subnet ranges.  This feature is available with  Postfix  ver-
          sion 2.11 and later.


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