Spammers find new ways to slip through

Just when it appeared tech firms had the upper hand against spam, spammers have unleashed new forms of the meddlesome e-mail to trick filters.

Spam in the form of popular PDF e-mail attachments and electronic greeting cards is confounding e-mail security systems and annoying consumers. The recent Storm e-mail 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.
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