Sender Policy Framework (SPF) is an email authentication standard used to prevent sender address forgery. By authenticating sender's mail server, the SPF protects senders and recipients from spams and email forgery. SPF also helps emails to be delivered to user's Inbox instead of the Spam folder.
By adding an SPF record to your DNS in the form of a TXT record, you as the domain owner approves a list of senders. The public list of senders can be a list of IP addresses or subdomains that are approved to send emails on your behalf. An SPF record list all authorized hostnames and IP addresses permitted to send email.
The receiving email servers can examine email headers to cross-check if the email received is from the approved list. If not, the receiving server can mark the email as a spam and deliver the email in the Spam Folder or not deliver at all.
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