[jakecopp]

Are you able to link to some info on how email could be compromised this way? I'd be interested to learn how to secure my domain.

[chillydawg]

Whoever hosts your DNS is the weak point. Account and login security with whoever they are is critical.

[brycehamrick]

DNS as well as registrar, which may be two different entities. You can either change the MX with the DNS host, or you can change the nameserver with the registrar.