On 28.07.2019 10:42, Brian Kantor wrote:
Interesting. When I look up the IP address, the rDNS returns the correct answer:
% host 44.76.7.7 7.7.76.44.in-addr.arpa domain name pointer mailman.ampr.org.
What happens when you look it up on your host?
Resolves to mailman.ampr.org too.
I will check mail server logs to see if I can find anything interesting.