An email whitelist is a list of "approved" or "safe" email senders. An email whitelist tells your email client that you know and trust the messages that come from that email address. Once an email address is whitelisted, messages from that sender will not appear in the spam folder and will remain in your inbox.
Whitelists are valuable tools for your deliverability, as you can prompt your subscribers to add your email address to their whitelist, ensuring that your emails reach the intended inbox and do not get routed into a spam, junk, or promotions folder.
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