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やめろ。
アメリカの連邦スパム規制法（CAN-SPAM ACT）のページ（https://www.ftc.gov/tips-advice/business-center/guidance/can-spam-act-compliance-guide-business）には
You can’t charge a fee, require the recipient to give you any personally identifying information beyond an email address, or make the recipient take any step other than sending a reply email or visiting a single page on an Internet website as a condition for honoring an opt-out request.
って書いてあるぞ。
Yahoo! Japanはメルマガの配信解除にログインを要求するのをやめろ。
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