Apple’s Mail.app can be configured to send custom headers with each e-mail sent. The usual “defaults” command is your friend. Here is an example (enter on one line) :
defaults write com.apple.mail UserHeaders
'{"X-Message-Flag" =
"Microsoft Outlook Fatal Error. Please reboot your system.";}'
If you enter this command into Terminal, it will send the X-Message-Flag header with every message.
What’s interesting (and kind of fun) is how Microsoft Outlook interprets the “X-Message-Flag” header. It will show it a bit like a warning just above the e-mail headers.
I wonder how many people will reboot their PC during 2008 just because I have this header there 
It however rise another question : why are the Windows users still using Outlook, when you have good alternatives like Thunderbird ? And why are they paying for Office when you have the excellent Openoffice ?
Anyway, if you have interesting values for X-Message-Flag, let me know in comments.
If you get too many complaints and want to get rid of the flag above :
defaults read com.apple.mail UserHeaders
defaults delete com.apple.mail UserHeaders
Warning : I haven’t found how to delete a single User Header, this delete command get rid of all your custom headers.
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