Internet Direct (Indy) Version 9.0.2 Beta
TMXRecord.Preference
Indicates the priority given to the mail exchange server.

property Preference: word;
Description
Preference is a read-only Word property that indicates the priority given to a particular ExchangeServer. A lower value in Preference indicates a higher priority.

Use ExchangeServer to determine the host name tha can act as a mail exchange for the domain.