From: Brian Candler <b.candler@...>
Date: 2008-11-04T17:37:41+09:00
Subject: Re: How to send mail with High priority

Heesob Park wrote:
> Add Priority: Urgent and Importance: High headers like this:

Which are, of course, ignored by virtually every MTA on the planet, 
since RFC 2822 does not define these headers, nor the way they should be 
handled.

However they might be highlighted with a flag in the receiver's MUA 
though, depending on what MUA they use, and perhaps that's all you want.

There's a list of non-standard or experimental headers you can try in 
RFC 2076 (see esp. section 3.9)
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