Simple definition
A record DNS which indicates which servers receive emails from a domain.
Technical definition
Mail Exchanger record contains a host name and priority. Senders use this information to choose the destination server.
What is it used for ?
Direct the receipt of messages to the correct mail provider.
Practical example
The field entreprise.fr can have an MX pointing to the platform Microsoft 365 or a Infomaniak server.
Common issues
- MX pointing to a former supplier
- Incorrect priorities
- MX target not resolving
Related terms
Key takeaway: This entry explains the general operation of the term. Exact settings may vary depending on software, vendors and environments.