Checked my sent folder, and apparently on the 15th I sent about 8 emails, each addressed to about a dozen different people.And the body of each of the messages is nothing but a link, but it's different for each of the 8 emails.
change your password and scan for viruses
I got one of your mails. Pic in a sec
http://www.calldrdave.com/wp/2012/07/new-threat-for-yahooattsbcglobal-net-email-users/
-snip-I believe that's all of them.