Restrict users to certain domain

Restrict users to certain domain

   KB 2265        Last updated on 2018-02-15  

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This document describes how to restrict a list of users for sending emails to limited domains. Other users can send mails anywhere. All steps I am doing here as Zimbra user. These steps are verified on ZCS 7.x or older. For ZCS8, looks for specific steps inline.

Restricting users to send mails to certain domains

Change all "hash" lines to "lmdb" in 8.5+ versions.

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

Note: If you would like to restrict all users of a domain, enter the domainname instead of email ids. For example:            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.

Important Note if you need to undo this configuration

Remove the two lines that were added to the file. Make sure the Postfix setting smtpd_restriction_classes has nothing set.

postconf -e smtpd_restriction_classes=' '
zmmtactl reload

Related Articles

Verified Against: unknown Date Created: 10/21/2007
Article ID: Date Modified: 2018-02-15

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