Microsoft Corp. (MSFT) said on Wednesday it has adopted an e-mail "whitelist" program by IronPort Systems Inc. that will allow legitimate marketers to thread the gauntlet of spam filters protecting its inboxes. Microsoft's Hotmail and MSN e-mail services, which together claim 170 million regular users, will require marketers to put money up front if they wish to ensure their messages aren't mistaken for unwanted spam.
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