Someone else posted this on the list earlier. It catches the use of tiny fonts and it got triggered on the mail you posted.
describe LOC_TINY_FONT_1 Body contains 1pt font rawbody LOC_TINY_FONT_1 /\<.*font\-size\:[ \"]*1[^0-9]+.*\>/i score LOC_TINY_FONT_1 10 rawbody LOC_TINY_FONT_0 /\<.*font\-size\:[ \"]*0[^0-9]+.*\>/i describe LOC_TINY_FONT_0 Body contains 0pt font score LOC_TINY_FONT_0 10
