A variety of interest groups have joined forces to <A HREF="http://www.cnn.com/2006/TECH/internet/02/28/email.rebellion.ap/index.html">fight a proposed bulk emailing fee</A> they claim strikes at the heart of online communication--a level playing field for rich and poor. America Online plans to introduce a service that would charge businesses and other bulk emailers a fee to route their email directly to a user's mailbox without first passing through junk mail filters. Another major provider, Sunnyvale, California-based Yahoo Inc., in the coming months will test an optional certified email program based on "transactional" messages only, such as bank statements and purchase receipts, Yahoo spokeswoman Karen Mahon said. The alliance protesting the move includes liberal activist group MoveOn, the conservative activist group RightMarch.com, the U.S. Humane Society, labor and environmental groups and online medical communities.