Block user to send email locally or externally

Block user to send email locally or externally

   KB 23348        Last updated on 2023-02-16  

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How to block users to send email locally or externally.


ZCS 8.8.x and Later

Step 1:

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

POSTCONF    smtpd_restriction_classes  local_only
POSTCONF    local_only  FILE

Note: We can find like below


Step 3:

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

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

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:            local_only

Step 5:

Create an empty file /opt/zimbra/common/conf/local_domains, here we list all the domains where restricted users allowed to send mails. But we will keep this blank file as we don't want to send emails inside or outside from this id.
Following is the command :

touch /opt/zimbra/common/conf/local_domains

Note: When we keep this file empty restricted sender can not send self email as well.

i.e.: Allow User/Domain ( OK/ OK)

Step 6:

Set ownership permissions for created files

chown zimbra:zimbra /opt/zimbra/conf/
chmod 644 /opt/zimbra/conf/
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: Navdeep Mathur
Verified Against: Date Created:
Article ID: Date Modified: 2023-02-16

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