Set a NULL MX for the subdomains

[d4rklynk]

It seems you dot not use email for the subdomains live.worldcubeassociation.org

As per the RFC 7505, you should set a NULL MX.

It's a special instruction that says the domain will not accept receiving email.

In practice, it looks like so: I sent an email to one of my subdomains, I received 1 minute later this email.

As you can see, it know instantly that it can't send the email to that subdomain -> end of story.

See how it looks in DNS:

[d4rklynk]

This NULL MX should be set for every subdomains an domains that do not use email.

[jonatanklosko]

Thank you, I added the record :)