Web, domains and email
MX
Abbreviation for Mail Exchange
In short and in plain language
An MX record is an entry for a domain. It says which server accepts email for that domain.
Without a suitable record, mail sent to your address does not arrive.
When mailboxes move to a new provider, this record is changed.
Definition
An MX record is an entry in the Domain Name System that states which server accepts email for a domain. Without a suitable record, mail sent to your own address does not arrive. When mailboxes move to a new provider, this record is switched.