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DNS on Windows 2000, Second Edition by Cricket Liu, Matt Larson

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Name

MX (mail exchanger) — (From RFC 1035, page 17)

Textual representation:

                     owner ttl class MX preference exchange-dname

Example:

ora.com.  IN  MX  0  ora.ora.com.
          IN  MX  10 ruby.ora.com.
          IN  MX  10 opal.ora.com.

Binary representation:

MX type code: 15
    +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
    |                  PREFERENCE                   |
    +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
    /                   EXCHANGE                    /
    /                                               /
    +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+

where:

PREFERENCE

A 16 bit integer which specifies the preference given to this RR among others at the same owner. Lower values are preferred.

EXCHANGE

A domain-name which specifies a host willing to act as a mail exchange for the owner name.

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