That's one of the best-practices recommendations the Big Four -- AOL, Yahoo!, Microsoft and EarthLink -- issued today in a report outlining their best ways to fight spam.
None of the recommendations breaks any new ground for legitimate, ethical bulk emailers, as you can see from this list:
* Do not harvest e-mail addresses through SMTP or other means (defined as collecting e-mail addresses, usually by automated means) without the owners' affirmative consent. * Register your e-mail domain with a creditable safelist provider. * Always provide clear instructions to customers about how to unsubscribe or opt-out of receiving e-mail. Promptly respond to these requests. * Do not use or send e-mail that contains invalid or forged headers. * Do not use or send e-mail that contains invalid or nonexistent domain names in the From or Reply-To headers. * Do not employ any technique to hide or obscure any information that identifies the true origin or the transmission path of bulk e-mail. * Do not use a third party's Internet domain name or allow mail to be relayed from or through a third party's equipment without permission. * Do not send e-mail that contains false or misleading information in the subject line or in its content. * Monitor SMTP responses from recipients' mail servers. Promptly remove all e-mail addresses for which the receiving mail server responds with a 55x SMTP error code (e.g., "user doesn't exist").
Each site has a copy of the report and the press release. For brevity, here's the Yahoo! report. We'll post the rest shortly.
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