contentwithcontent - 4:42 pm on Apr 22, 2007 (gmt 0)
I would recommend first and foremost correcting the problem and then going through your entire site and make sure your pages are following the guidelines, then submitting a re-inclusion request, You DO NOT have to be excluded to submit one.
You can mention the email you received in the text of the message.
example: I was notified of a problem with my site via an email stating that there was hidden text in my website. I have removed the hidden text and corrected the problem.