I’ve seen this trick used by a few senders recently, with varying effectiveness. Where do they get these pictures? While you can scatter any images you like across the body of your message, the subject line is limited to just text. But “text” is more than just “a, b, c” – using RFC 2047 encoding you can use any character you like, including many tiny pictures...
January 2, 2013
Images in the subject line
02January