 So let's talk about SPF. SPF is an acronym that stands for Sender Policy Framework, and it's a mechanism that's been around for many years now to help prevent malicious actors from spoofing emails from senders. If you go and Google SPF online, you're going to find a lot of really useful information to summarize all of that useful information that you'll find on the internet though. It's just a way to help prevent jerks from spoofing emails. The way that SPF works is whenever a user sends an email from a domain, in this case we're going to be using the domain moderndigitaloffice.com is our example, you know that email gets sent from that domain's outbound mail server. It gets received by the recipient's mail server, and that recipient's mail server looks at a couple things to decide whether or not it's a valid email. It checks to see if the domain in this case moderndigitaloffice.com has an SPF record and verifies that the server that sent that message is valid according to the things that are set up in the SPF record. If the email is valid, it gets delivered. If it's not valid, then it gets rejected. It's pretty much as simple as that.