Whitelist is a list of approved senders or domains that are exempted from spam filters and allowed to deliver emails to a recipient's inbox. It is a way to ensure that important emails from trusted sources are not blocked or marked as spam. Users can add email addresses or domains to their whitelist manually or by using automated tools provided by email clients or internet service providers (ISPs).
Whitelisting is a crucial step in email deliverability, especially for businesses that rely on email marketing to reach their customers. Without a whitelist, emails may end up in the recipient's spam folder or may not be delivered at all. By whitelisting trusted sources, businesses can ensure that their emails are delivered to the recipient's inbox and are more likely to be read and acted upon.