Block user for send email to some external email

Block user for send email to some external email


   KB 24433        Last updated on 2022-05-26  




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Problem

How to block user for send email to some external email ?

Solution

ZCS 8.8.x and Later

Step 1:

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

%%contains VAR:zimbraMtaSmtpdSenderRestrictions check_sender_access lmdb:/opt/zimbra/common/conf/restricted_senders%%

Then execute:

zmprov ms `zmhostname` +zimbraMtaSmtpdSenderRestrictions "check_sender_access lmdb:/opt/zimbra/common/conf/restricted_senders"

Step 2:

Open file /opt/zimbra/conf/zmconfigd.cf and add below lines before "RESTART mta".

POSTCONF    smtpd_restriction_classes  local_only
POSTCONF    local_only  FILE  postfix_check_recipient_access.cf

Note: We can find like below

SECTION mta DEPENDS amavis
 -----------
 -----------
 -----------
RESTART mta

Step 3:

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

check_recipient_access lmdb:/opt/zimbra/common/conf/local_domains, permit

Step 4:

Create a file /opt/zimbra/common/conf/restricted_senders and enter the list of users that you want to block. Follow this syntax:

user@yourdomain.com            local_only

Step 5:

Create a file /opt/zimbra/common/conf/local_domains, here list all the domains/emails where restricted users denied sending mails.

USER@DOMAIN.TLD REJECT
YOURDOMAIN.TLD REJECT

Step 6:

Set ownership permissions for created files

chown zimbra:zimbra /opt/zimbra/conf/postfix_check_recipient_access.cf
chmod 644 /opt/zimbra/conf/postfix_check_recipient_access.cf
chown :zimbra /opt/zimbra/common/conf/restricted_senders
chmod 775 /opt/zimbra/common/conf/restricted_senders
chown :zimbra /opt/zimbra/common/conf/local_domains
chmod 775 /opt/zimbra/common/conf/local_domains

Step 7:

Run the below commands as Zimbra user.

postmap /opt/zimbra/common/conf/restricted_senders
postmap /opt/zimbra/common/conf/local_domains
zmmtactl stop
zmmtactl start
Submitted by: Ankit Dagdi
Verified Against: Date Created:
Article ID: https://wiki.zimbra.com/index.php?title=Block_user_for_send_email_to_some_external_email Date Modified: 2022-05-26



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