I've helped with product development and product sourcing for some time here in Hong Kong. This means I've attended many tech trade shows and passed out countless business cards. Since these are Chinese businesses, this provides great tests for my SpamAssassin installation.
The latest trick that certain mainland spammers have taken up is creating Yahoo groups and then signing my email address up to receive the emails for their group. Yahoo Groups does not require an email confirmation for 3rd Party signup to the Yahoo Groups. The admins in news.admin.net-abuse.email knew this was a recipe ...