I get a lot of emails from various different people and I am on a lot of groups at yahoo.  One lady had a signature line that was advertising ChecksUnlimited Coupons.  Most people just advertise about a business in their signature line, but this was the first time I saw this kind of advertisement.  I emailed her back and asked her if she has received many orders from it and she says she does.  She advertises all over with that advertisement and says she often receives email replies back asking her if they could be added to her email list, as they want to hear more about what she does.  Another great way to advertise!