How to restrict outgoing email as well as external web access for certain users?

Posted by aionman on Jul 9, 2015 in Zimbra |

Restricting users to send mails to certain domains

1. Enter following in the file “/opt/zimbra/conf/”. Make sure it is entered at the top of the file.

ZCS 8.x: Enter in file /opt/zimbra/conf/zmconfigd/

vi /opt/zimbra/conf/
check_sender_access hash:/opt/zimbra/postfix/conf/restricted_senders 

Note: This line should be added after the reject_non_fqdn_recipient line
Note: ZCS 8.5 and later use lmdb databases, not hash databases

2. Enter following in “/opt/zimbra/conf/”

ZCS 8.x: Enter in file /opt/zimbra/conf/

vi /opt/zimbra/conf/
Find the section labeled SECTION mta and enter the following two lines directly below
POSTCONF    smtpd_restriction_classes      local_only
POSTCONF    local_only        FILE

3. Create a file “/opt/zimbra/conf/”

vi /opt/zimbra/conf/
check_recipient_access hash:/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:

vi /opt/zimbra/postfix/conf/restricted_senders            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:

vi /opt/zimbra/postfix/conf/local_domains              OK      OK

6. Run following commands:

postmap /opt/zimbra/postfix/conf/restricted_senders
postmap /opt/zimbra/postfix/conf/local_domains 
zmmtactl stop 
zmmtactl start

After these settings, all the users listed in “/opt/zimbra/postfix/conf/restricted_senders” are restricted to send mails only to domain which are defined in “/opt/zimbra/postfix/conf/local_domains”, other are fully allowed to send mails anywhere. These settings will not survive Zimbra upgrades, please make sure that you backup of all these settings while performing upgrades.


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