Restricting Users to Send mails to Certain Domains on Zimbra 8.5 and above


Please make sure to make all this changes you are using the zimbra user no root user because when you create the databases with root user doesn't work it's not creating the databases required as lmdb root create the databases with postmap as hash be aware of this.

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.

make a search for RESTART mta and add the lines before of the RESTART 

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:
domainame.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

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