America Online is testing an antispam filter intended to accurately trace the origin of e-mail messages, a move that could bring new accountability to the Net if it proves reliable.

The online unit of media giant Time Warner last week implemented SPF, or Sender Permitted From, an emerging authentication protocol for preventing e-mail forgeries, or spoofing. The trial involves the company's 33 million subscribers worldwide and is the first large-scale test for the protocol, which standards groups are considering along with various other e-mail verification proposals.
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