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TL;DR: No, Sender Policy Framework (SPF) won’t fix all your spoofing problems and DKIM by itself will prevent nothing.

I am not able to explain email and SMTP in detail end-to-end in the time it would take for this post but there are some core things that need to be understood before we can move on. The best illustration is to use telnet to send an email via an SMTP server (I have indented the server responses to make it more clear:)

EHLO mycomputer.mydomain.com 250- redacted smtp.mydomain.com [10.10.10.10], pleased to meet you MAIL FROM: [email protected] 250 2.1.0 [email protected] ... Sender ok RCPT TO: [email protected] 250 2.1.5 [email protected] ... Recipient ok DATA 354 Enter mail, end with "." on a line by itself From: Bob Smith < [email protected] > Reply-to: < [email protected] > Subject: Hello World Message body contents. . 250 2.0.0 wASDDusO0124297 Message accepted for delivery The above example is not only how we send messa

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