Restrict account from sending emails to all domains

Restrict account from sending emails to all domains

 - This article is a Work in Progress, and may be unfinished or missing sections.

Problem

How to restrict a single account from sending emails to all domains.

Resolution

Steps:

1) Specify the account for which the restriction is applied.

echo "test@example.com restrict_sender" > /opt/zimbra/postfix/conf/restrict_senders 

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

echo "yourdomain.com restrict_sender" > /opt/zimbra/postfix/conf/restrict_senders  

2)

postmap /opt/zimbra/postfix/conf/restrict_senders

3) Create a blank file in which no domain name is specified.

touch /opt/zimbra/postfix/conf/restrict_recipients 

4)

postmap /opt/zimbra/postfix/conf/restrict_recipients 

5) In the file /opt/zimbra/conf/zmconfigd.cf, find the "SECTION mta DEPENDS amavis", and enter the following before the "RESTART mta" line:

vi /opt/zimbra/conf/zmconfigd.cf

Enter the lines

POSTCONF smtpd_restriction_classes restrict_sender 
POSTCONF restrict_sender FILE postfix_restrict_sender.cf 

6) Enter the line below at the top of the /opt/zimbra/conf/zmconfigd/smtpd_sender_restrictions.cf file.

check_sender_access lmdb:/opt/zimbra/conf/restrict_senders

7)

vim /opt/zimbra/postfix/conf/main.cf 

Enter these two lines

smtpd_restriction_classes = restrict_sender 
restrict_sender = check_recipient_access lmdb:/opt/zimbra/conf/sender_recipients, reject 

8)

cd /opt/zimbra/conf 
echo "check_recipient_access lmdb:/opt/zimbra/conf/sender_recipients, reject" >> postfix_restrict_sender.cf 

9)

zmmtactl restart