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+====== How to Block E-mail by Domain in cPanel ======
+To block a domain from being able to send or receive mail, use the following steps.
+Log into SSH and run the following commands:
+<note tip>
+Make sure to replace example.com with the domain that you want to block
+</note>
+<code>
+touch /etc/blockeddomains
+echo "example.com" >> /etc/blockeddomains
+</code>
+Log into **WHM**, then go to Service Configuration > Exim Configuration Editor > Advanced Editor. In the topmostbox add the following:
+<code>
+domainlist blocked_domains = lsearch;/etc/blockeddomains
+</code>
+In the **ROUTER CONFIGURATION** section after the following lines:
+<code>
+democheck:
+driver = redirect
+require_files = "+/etc/demouids"
+condition = "${if eq {${lookup {$originator_uid} lsearch {/etc/demouids} {$value}}}{}{false}{true}}"
+allow_fail
+data = :fail: demo accounts are not permitted to relay email
+</code>
+Add the following lines:
+<code>
+reject_domains:
+driver = redirect
+# RBL Blacklist incoming hosts
+domains = blocked_domains
+allow_fail
+data = :fail: Connection rejected: SPAM source $domain is manually blocked.
+</code>
+Once you have added the lines, hit **Save** at the bottom.
+\\
+\\
+\\