To pick on one bulk political mailer, Kintera.Org, mail from
contains a tracking gif, a 1x1, within the html portion of a multipart MIME
payload. Voila:
<img height=3D’1’ width=3D’1’ src=3D’http://www.kintera.org/omt/70069677.gif’>
Yes I've kevetched to the Kucinich campaign that putting tracking gifs in
political marketing is dumb, but to no avail. Of course the html contains
more URLs than just the one into Kintera's mail delivery and click-through
tracking playpen.
Wrong community I know (ASRG is over there) but something like DCC that
catches the "twinkle" of a spam's URL payload by nsen niggles me.
Eric