Mail address on the About page invalid?

[odergatter]

http://www.diveintopython3.net/about.html

At the bottom there's a mailTo Link: mark@diveintomark.org

My mail provider says: Recipient not found.

[RubenGarcia]

Confirmed this is still an issue on 28 Feb 2019.

[Chaostheorie]

The domain has changed owners. It's now owned by someone using https://www.dreamhost.com/.