I created a post on cPanel. Hopefully they'll have some good answers come 
through on there.

https://support.cpanel.net/hc/en-us/community/posts/28706820128407-Mailman-on-cPanel-not-able-to-send-to-external-domains

One issue I found is it could be the host is blocking the outgoing port that 
Mailman uses. So I'm asking my hosting provider about that possibility.

Grace and Peace,
Jeff
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