Sender Policy Framework (SPF) is a technical standard that helps protect e-mail senders and recipients from spam, spoofing, and phishing. It’s a form of e-mail authentication.
Consider an imaginary situation. My web site address is https://sanjibsinha.fun. Now, I use a few e-mail addresses for various purposes. I send e-mails from these addresses and get replies to those addresses. One of them is support@sanjibsinha.fun. If my SPF is not correct, that is to say, if I don’t maintain the regulated technical standard for that purpose, then any bad guy can send e-mails ...
