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>>>> Is there a way I can fix it from WHM
Log in to WHM as root user and browse following URL....
Check port 20 is open in the server firewall.
you can allow port 20 in iptables
iptables -A INPUT -s 0/0 -p tcp --dport 20 -j ACCEPT...
If you are sure your server is rooted , then its always better to do an OS reload.
If you are still stay with the current OS , then you...
From your first thread , its clearly saying the load is due to the following process
" 29038 leggedia 16 0 161m 57m 6872 R 7.2...
As the above , seems that you have setup the default address. Default address will save all the unrouted mails to your domain. You can...