Block Domain to Send Mail in CPanel

Description: If any domain send huge spam then you can block domain to send mail
Procedure:

• Open SSH console using root user
• Check /etc/blockeddomains file exists or not
• Add domain name in this file that you want to block using below command
• # echo "thedomain.com" > /etc/blockeddomains
• After add it set permission on this file using below command
• # chown root.mail  /etc/blockeddomains
• # chmod 644 /etc/blockeddomains
• Login WHM and go to “EXIM Configuration Manager”
• WHM - Service Configuration - Exim Configuration Manager - Advance Editor
• Search for "Add additional configuration setting" This can be located by fourth of the way of scroll down

• Add entry : domainlist blocked_domains = lsearch;/etc/blockeddomains

• Search for "ROUTERSTART"  and add following entry
• reject_domains:
  driver = redirect
  domains = +blocked_domains
  allow_fail
  data = :fail: Connection rejected: SPAM source $domain is manually blacklisted.
• Restart exim service after make changes
• If you want to add more domain then add entry it in  /etc/blockeddomains