
Just when it appeared tech firms had the upper hand against spam, <A HREF="http://www.usatoday.com/tech/news/computersecurity/2007-08-15-spam_N.htm?csp=34">spammers have unleashed new forms</A> of the meddlesome email to trick filters.
Spam in the form of popular PDF email attachments and electronic greeting cards is confounding email security systems and annoying consumers. The recent Storm email virus and several pump-and-dump stock scams are clogging inboxes and snookering consumers into downloading malicious software. And it could get worse as the holidays approach, anti-spam experts say.