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FWIW, here's the results I got from a port scan of that public IP address...
Code:
~> nmap 50.198.190.20
Starting Nmap 7.70 ( https://nmap.org ) at 2019-04-10 12:02 NZST
Nmap scan report for 50-198-190-20-static.hfc.comcastbusiness.net (50.198.190.20)
Host is up (0.19s latency).
Not shown: 846 closed ports, 152 filtered ports
PORT STATE SERVICE
22/tcp open ssh
80/tcp open http
Nmap done: 1 IP address (1 host up) scanned in 17.37 seconds
Check that your ISP is not blocking that port as well.
I feel like such a chump. I was a sys admin in the computer science department at the U of U for about a quarter of a century, seen a lot of variations of UNIX based systems, etc. etc.
The problem here was amazingly easy to fix. I spelled the hostname correctly in main.cf and it works now.
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