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ZCS 8.7 and later

• Create file #  vi /opt/zimbra/common/conf/postfix_reject_sender      with the list of email addresses and domains to be rejected in the below format:

 user@domain.com REJECT   domainX.com REJECT

• • execute the zimbraMtaSmtpdSenderRestrictions

zmprov ms 'yourzimbraservername' +zimbraMtaSmtpdSenderRestrictions "check_sender_access lmdb:/opt/zimbra/conf/postfix_reject_sender"

• postmap it

/opt/zimbra/common/sbin/postmap /opt/zimbra/conf/postfix_reject_sender

zmmtactl restart

How To Block Emails Or Domains On Zimbra 8 MTA

1. Create a postfix_reject_sender file with the following command

Enter the email or domain that will be blocked according to the following example.

5. To check zimbraMtaSmtpdSenderRestrictions successfully installed using the following command.

If successful, it will appear as follows

zimbraMtaSmtpdSenderRestrictions: check_sender_access lmdb:/opt/zimbra/common/conf/postfix_reject_sender

Add emails in the block list

1. Enter the email you want to block

2. Post folder long

Rollback configuration

1. Enter the following command for rollback

zmprov ms `zmhostname` -zimbraMtaSmtpdSenderRestrictions "check_sender_access lmdb:/opt/zimbra/common/conf/postfix_reject_sender"

zmmtactl restart

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