The CAN-SPAM Act has a section on the issue of unsubscribing from e-mails. In CAN-SPAM's Compliance Guide for Businesses, the FTC states, "you can’t charge a fee, require the recipient to give you any personally identifying information beyond an e-mail address, or make the recipient take any step other than sending a reply e-mail or visiting a single page on an Internet website as a condition for honoring an opt-out request." This seems pretty clear-cut to us: forcing users to log in to manage e-mail preferences is a two-plus-webpage process.
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