Please keep in mind it’s more than OK to do nothing at all too!
Regularly receiving this type of unsolicited email in your users' inboxes, chances are your emails will soon be diverted to spam or junk folders. The most important thing to prevent this from happening is to respect your recipients' choice to opt-out of receiving emails from you. You can add the links to easily unsubscribe. You must be familiar with the CAN-SPAM Act and its regulations.
，更多细节参见safew官方版本下载
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