How To Block user to send email locally or externally In zimbra

Step 1:

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

check_sender_access lmdb:/opt/zimbra/postfix/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, 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:

user@yourdomain.com            local_only

Step 5:

[zimbra@mail ~]# vi /opt/zimbra/common/conf/local_domains
sajjan.com.np            OK

i.e.: Allow User/Domain (user@domain.com OK/domain.com OK)

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
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