Restrict users to certain domain

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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

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

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

vi /opt/zimbra/conf/postfix_recipient_restrictions.cf
check_sender_access hash:/opt/zimbra/postfix/conf/restricted_senders 


2. Enter following in "/opt/zimbra/conf/zmmta.cf"

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

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


3. Create a file "/opt/zimbra/conf/postfix_check_recipient_access.cf"

vi /opt/zimbra/conf/postfix_check_recipient_access.cf
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
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:

vi /opt/zimbra/postfix/conf/local_domains
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

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 zmmta.cf 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: http://wiki.zimbra.com/index.php?title=Restrict_users_to_certain_domain Date Modified: 08/13/2013
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