email - PHP mail() - How to set Priority?

Question

Is there any way to set the priority of PHP mail()? I looked at the online manual but I can't find any reference to it.

By priority, I mean High, Normal, Low or 1, 2, 3 in the headers. So the recipient knows the urgency of the mail.

Thank you!

question from:https://stackoverflow.com/questions/4169605/php-mail-how-to-set-priority