The address is http://18.104.22.168/viewtopic.php?f=7&t=12131.... etc.
It resolves to
IP Address : 22.214.171.124
Location : Netherlands (95% accuracy)
Host Name : tartini.debian.net
whereas debian.net is
Host Name : debian.net
IP Address : 126.96.36.199 and 188.8.131.52 and 184.108.40.206 and 220.127.116.11 and 18.104.22.168
Location : United States
I guess it's just a mirror but just wondering why it doesn't resolve the IP address. Another topic notification email I got at the same time resolved normally.