Specifies the message priority.

TIdMessagePriority = (mpHighest, mpHigh, mpNormal, mpLow, mpLowest);

TIdMessagePriority is an enumerated type used to describe the priority of a message. TIdMessagePriority can contain one of the following values:

• mpHighest - The message should be given the highest priority.

• mpHigh - This message should be given a high priority.

• mpNormal - This message should be given the normal priority. This is the default value.

• mpLow - This message should be given a low priority.

• mpLowest - This message should be given the lowest priority.

TIdMessagePriority is used by TIdMessage to represent the value of either the "Priority:" or "X-Priority:" headers in a RFC 822 message.