Anyway, I don't know this server's internal infrastructure, but doesn't it use a service provider in front of the real server?
(Sometimes there is an error message when background server is not available.)
So the address you see is not the address of the real server, however, outgoing mails (from forum) are another question, so they may simply use a service provider for this purpose... 🙂
...okay, checked its last mail and it comes from something like sendgrid.net
Anyway, @silversolver told he use an own server without excessive SPAM filtering, so most likely not the IP address is th