Adding a custom header to an email?
 

Is it possible (in any way) to add a custom header to an email (such as the "X-header" used by spam filtering boxes)? I've tried the obvious approaches, and none seemed to work. Is this impossible?

Wirelessly posted (8700c: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0) BlackBerry8700/4.1.0 Profile/MIDP-2.0 Configuration/CLDC-1.1 VendorID/102)

You can use autotext to add info using 2 letters but nothing automatically and it would be part of the text field.

I should have specified... I mean a custom MIME header. Things specified by RFC 2049 and others.
I sincerely doubt the BlackBerry APIs let me. I've tried the only obvious function to do it with.