#nano /opt/zimbra/conf/zmconfigd/smtpd_sender_restrictions.cf
tambahkan check_sender_access hash:/opt/zimbra/conf/domainrestrict
#nano /opt/zimbra/conf/domainrestrict
localdomain.com REJECT You're not me! anotherlocaldomain.com REJECT You're not me!
#/opt/zimbra/postfix/sbin/postmap /opt/zimbra/conf/domainrestrict
#su zimbra
$zmmtactl stop
$zmmtactl start
Done now test it :D
#telnet yourdomain.com 25HELO yourdomain.commail from: user@localdomain.comrcpt to: user2@yourdomain.com
554 5.7.1 <user@localdomain.com>: Sender address rejected: You're not me!