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Mail Exchanger (MX) Resource Record Dialog Box

Applies To: Windows Server 2008, Windows Server 2008 R2

 

Item Details

Host or child domain

The single-part name for a mail exchanger in this zone. If you need to add a name here that contains a period (.) to indicate the name of an additional domain level, first add the additional domain separately in DNS Manager and then add a new mail exchanger (MX) resource record there as a single-part name.

Fully qualified domain name (FQDN)

The domain name to which this resource record applies. The fully qualified domain name (FQDN) uniquely identifies the DNS hierarchical tree by specifying a list of names that are separated by dots in the path from the referenced domain or host to the root.

Fully qualified domain name (FQDN) of mail server

An FQDN for a host that is willing to act as a mail exchanger for the owner that is specified in Host or child domain. This can be any name that DNS recognizes as a full and valid name for a host computer that runs a mail server. The name that you type here must resolve to a corresponding host (A) resource record in this zone. If you are unsure of which FQDN to use, click Browse to search the DNS namespace for this name.

Mail server priority

A number between 0 and 65535 that indicates the mail exchange server’s priority with respect to the other mail exchange servers. Lower numbers are given preference to servers that are referenced in mail exchanger (MX) resource records with higher priority numbers. The highest priority or preference for a mail exchange server is granted when a value of zero (0) is used.

Where more than one mail exchanger (MX) resource record is present, the mailer attempts delivery to the mail exchange server with the lowest preference number first. If delivery fails, the mail exchange server with the next highest preference number is tried.

If two or more mail exchange servers share the same preference number, the mailer tries the mail exchange servers with the same number at random.

See Also

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