How to block incoming users or domains

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#su zimbra
$vi /opt/zimbra/common/conf/postfix_reject_sender
user@domain.com REJECT
domainX.com REJECT
$zmprov ms 'yourzimbraservername' +zimbraMtaSmtpdSenderRestrictions "check_sender_access lmdb:/opt/zimbra/common/conf/postfix_reject_sender"
$/opt/zimbra/common/sbin/postmap /opt/zimbra/common/conf/postfix_reject_sender
$zmmtactl restart
REF:


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