[zimbra@mail root]$ head -1 /opt/zimbra/conf/zmconfigd/smtpd_recipient_restrictions.cf
check_sender_access hash:/opt/zimbra/postfix/conf/restricted_senders
[zimbra@mail root]$ vim /opt/zimbra/conf/zmconfigd.cf
SECTION mta DEPENDS amavis
POSTCONF smtpd_restriction_classes local_only
POSTCONF local_only FILE postfix_check_recipient_access.cf
[zimbra@mail root]$ cat /opt/zimbra/conf/postfix_check_recipient_access.cf
check_recipient_access hash:/opt/zimbra/postfix/conf/local_domains, reject
[zimbra@mail root]$ cat /opt/zimbra/postfix/conf/restricted_senders
weyee@weyeenet.net local_only
[zimbra@mail root]$ cat /opt/zimbra/postfix/conf/local_domains
weyeenet.net OK
[zimbra@mail root]$ postmap /opt/zimbra/postfix/conf/restricted_senders
[zimbra@mail root]$ postmap /opt/zimbra/postfix/conf/local_domains
[zimbra@mail root]$ zmmtactl stop
/postfix-script: stopping the Postfix mail system
Stopping saslauthd...done.
[zimbra@mail root]$ zmmtactl start
Rewriting configuration files...done.
Starting saslauthd...done.
/postfix-script: starting the Postfix mail system