RE: Erroneous doubled letters in subject

[Kenneth Porter]

--On Tuesday, September 16, 2008 10:16 AM +0100 "Randal, Phil" 
<[EMAIL PROTECTED]> wrote:

I should make clear that PR_TD_NOWRAP does hit some ham here, so perhaps
it would be better named __PR_TD_NOWRAP.

What sources the ham that hits? What legitimately stuffs that string in 
email?

Is it legal HTML?