In a forward DNS zone, the MX record identifies the email server that will be used for email traffic for the domain.
So, this is correct. "It identifies the e-mail server to be used for e-mail traffic for the domain."
What is a DNS MX record?
A 'mail exchange' (MX) record in DNS directs email to a mail server. The MX record specifies how email messages should be routed using the Simple Mail Transfer Protocol. An MX record, like a CNAME record, must always point to another domain.
For these MX records, the 'priority' numbers before the domains indicate preference; the lower the 'priority' value, the better. Because 10 is less than 20, the server will always try mailhost1 first. If a message send fails, the server will fall back to mailhost2.
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