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!

Answer 1

That's usually done by setting following fields in the header:

• "X-Priority" (values: 1 to 5- from the highest[1] to lowest[5]),
• "X-MSMail-Priority" (values: High, Normal, or Low),
• "Importance" (values: High, Normal, or Low).

See the following example (taken from php's mail function documentation):

<?php
        $headers = "MIME-Version: 1.0
" ;
        $headers .= "Content-Type: text/html; charset="iso-8859-1"
";
        $headers .= "X-Priority: 1 (Highest)
";
        $headers .= "X-MSMail-Priority: High
";
        $headers .= "Importance: High
";

 $status   = mail($to, $subject, $message,$headers);
?>