MX record and its priority

These are special resource records for mail routing. An MX (Mail eXchanger) record specifies a domain name and an associated computer, the “mail exchange”, which is able to deliver e-mail to an e-mail address with this domain name.

A Sample MX record that you can register with 1&1 looks like this:

Domain Name MX1: Priority: 10 IP Address
Domain Name MX2: Priority: 20 IP Address
Domain Name MX1: Priority: 30 IP Address
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