David Frank has created a free Mail.app plug-in known as MailPriority which enables the X-Priority header. Not only can you set the outgoing priority value, but with Mail.app's rules, you can color-code your email based on the value of the X-Priority header.
MailPriority relies on an unpublished Mail.app API, so it may stop working at any time. However, since it installs as a bundle in your local Library folder, the Mail.app program is not modified in any way, and you can remove MailPriority by simply deleting the program.
MailPriority relies on an unpublished Mail.app API, so it may stop working at any time. However, since it installs as a bundle in your local Library folder, the Mail.app program is not modified in any way, and you can remove MailPriority by simply deleting the program.
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