The Laws Marketers Need to Know to Avoid Legal Backlash
Hubspot
FEBRUARY 10, 2012
Every email message you send out has to include your valid physical mailing address. Include an opt-out link, and honor unsubscribes promptly. You're required to search the Do Not Call Registry at least once every 31 days and remove from your call lists the phone numbers of new registrants. Regularly update your list.
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