MX and MXE Records

What is an MX record?

A mail exchanger (MX) record specifies how mail should be routed for email addresses at a specific domain name. An MX record specifies a host name which should point to a mail server responsible for accepting mail at the domain, and a preference number. If multiple MX records are configured, the sending mail server will try to deliver mail to the record with the lowest preference number first. If delivery fails, the sending server will then move on to the record with the next higher numbered preference.

Can I have more than one MX record?

Yes, you can have multiple MX records as long as every host name listed will accept mail for the domain and deliver it to the same place. Most mail servers will attempt delivery to the hosts with lower preference numbers first, but this isn’t guaranteed. Records with identical preference numbers will have load split fairly evenly between them.

Can I use multiple MX records to deliver mail to some addresses to one mail system and other addresses to another (for example, POP mail and third-party Hosted Exchange)?

No, you cannot divide mail delivery on a per-user basis for a single domain name. If you configure multiple MX records pointing to separate independent mail servers then mail delivery will be split between the two servers, with each server always receiving some of the mail addressed to all users at the domain. This will result in each server bouncing mail addressed to users that are only configured on the other server.

Can I use MX records to direct mail to different servers based on host name (for example, user@mail2.example.com)

Yes, you can use third level names to direct email to separate distinct servers. For example, if you wanted all mail addressed to users @user.example.com to be handled by one mail server and mail addressed to users @corp.example.com to be handled by another mail server, you could use the following records:

user   MX   10   server1.example.com

corp   MX   10   server2.example.com

Note: eNom’s POP Email product cannot be configured to use third level names.

What are MXE Records?

MXE records are MX “Easy” records. They allow you to configure mail delivery to a server based on IP address. An MX record requires a host name of the mail server, and the host name must also have an A record (usually, this is handled by the third party email service, if you are using one). An MXE record combines an MX record and an A record.

This entry in the control panel:

MXE   10.11.12.13

Will translate into these records in our DNS servers:

@   MX   10   mail.example.com

mail   A       10.11.12.13

Can I use multiple MXE records?

No, the MXE record automatically generates an A record and uses a default preference number, and cannot coexist with another MX or MXE record. If you require multiple records, use MX.

How do I set MX records?

Log in and click “Registered Domains”. Click the domain name for which you want to set host records. In the “Navigation” bar, open the “more” menu and select “MX Records”. Fill in the form as you wish, and click “Save Changes”.

How do I set MXE records?

Log in and click “Registered Domains”. Click the domain name for which you want to set host records. In the “Navigation” bar, open the “more” menu and select “MXE Records”. Fill in the form as you wish, and click “Switch Service to MXE Record”.

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