Priority
There is no SMTP standard for message priority. Most email applications use an X−Priority value of 3 for messages with "normal" priority. More important messages have lower values and less important messages have higher values. In most cases, urgent messages have an X−Priority value of 1. The priority code used with the Mail classes, and set in the headers are as follows:
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Highest Priority
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High Priority
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Normal
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Low Priority
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Lowest Priority
The default value is 3, that is, normal priority.
Different email programs render these different values in a variety of ways, usually using some kind of colored symbols or arrows.
Set the priority for an email using the Priority property. The following is an example:
&Email.Priority = 2;