Email Authentication is a set of methods that receiving email servers use to ensure that emails are not forged. Authenticating an email verifies that the email message actually came from the sender listed in the “from” field in the email header and that the email wasn’t changed by someone while it was in transit.
Authentication is critical to the delivery of emails and works as a license plate. It provides a trackable identifier that shows your recipient’s internet service provider that you are a legitimate sender. This also helps an email arrive in the inbox. Most email providers use Email Authentication as a shield to protect their users from spam, phishing scams, and other malicious emails.
SPF, DKIM, and DMARC are all standards that enable different aspects of Email Authentication. They address complementary issues.
These Email Authentication Standards supplement SMTP, the basic protocol used to send an email, and most modern email systems support them.
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