Restricting Users to Send mails to Certain Domains on Zimbra 8.5

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1. Open file /opt/zimbra/conf/zmconfigd/smtpd_sender_restrictions.cf and add this line at the top

 check_sender_access lmdb:/opt/zimbra/postfix/conf/restricted_senders

2. Open file /opt/zimbra/conf/zmconfigd.cf and add those lines before RESTART mta. This is example on my system

 POSTCONF    smtpd_restriction_classes  local_only
POSTCONF    local_only  FILE  postfix_check_recipient_access.cf
RESTART mta

3. Create a file /opt/zimbra/conf/postfix_check_recipient_access.cf and add the following line

 check_recipient_access lmdb:/opt/zimbra/postfix/conf/local_domains, reject

4. Create a file “/opt/zimbra/postfix/conf/restricted_senders” and list all the users, whom you want to restrict. Follow this syntax:

 user@yourdomain.com            local_only

5. Create a file “/opt/zimbra/postfix/conf/local_domains” and list all the domains where “restricted users” allowed to sent mails. Please follow this syntax:

 yourdomain.com              OK 
otheralloweddomain.com      OK
6. Run following commands

 postmap /opt/zimbra/postfix/conf/restricted_senders
postmap /opt/zimbra/postfix/conf/local_domains 
zmmtactl stop 
zmmtactl start
Please try to sending email to allowed domain and not allowed domain. If you insert new user on number 4 or new domain on number 5, don’t forget to running again number 6.

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