The Laws Marketers Need to Know to Avoid Legal Backlash
Hubspot
FEBRUARY 10, 2012
You must include a clear and obvious way for recipients to unscubscribe from all email communication from you, even if you also provide a list of other types of email to which they can subscribe instead. Regularly update your list. Do not call people on your list before 8 AM or after 9 PM. At the very least, limit it.
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