I emailed IANA (Internet Assigned Numbers Authority) earlier today to ask about the new content on example.com. To my surprise, their VP replied. Here is the email: I am happy to try and answer any questions you have. The changes we make to the site from time-to-time are usually informed by a desire to either reduce the overall bandwidth demands of serving the site, or improve its utility. At its heart it is a placeholder...
I use something like
user@invalidOr
user@domain.invalidinvalida reserved TLD meant for basically this exact use-case.See RFC 2606
Time to reset the dB again
I used user@example.com … so should that be fine or not?
It will fail immediately, so that’s fine.
$ host -t mx example.com example.com mail is handled by 0 .testwould work too