You can try the following steps. First, in root SSH, run these commands:
كود:
touch /etc/blockeddomains
echo "domain.com" >> /etc/blockeddomains
Please replace domain.com with the domain name. Do not replace the "" part as that's required, only the domain.com part with the right domain name.

In WHM > Exim Configuration Editor > Advanced Editor, put the following in the topmost box:

كود:
domainlist blocked_domains = lsearch;/etc/blockeddomains
Locate the "ROUTERS CONFIGURATION" section, and right below these lines:
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

Put the following lines:
كود:




كود:


 	 	reject_domains:

driver = redirect
# RBL Blacklist incoming hosts
domains = blocked_domains
allow_fail
data = :fail: Connection rejected: SPAM source $domain is manually blacklisted.