Email whitelist is a list of approved or “safe” email addresses of which a spam filter always allows delivery. Typically, a user has to manually add the sender or the sender’s address to a list of “approved” or “safe senders” within his or her email client for an address to be whitelisted, which is a different process in various email clients.
Many email marketers send out a message to their subscribers like, “To be sure our emails always make it to your inbox, please add us to your email whitelist.” to help their emails make it to subscribers’ inboxes.
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