 So the very first step is collecting the domain. That's certainly the easiest one The domain is just the domain that you're using for sending email So in the case of our demo here, we're going to be using the domain modern digital office comm The next step is collecting the domain GUID The simplest way to go find the domain GUID would be to Either open up a DOS box and do an MX lookup or just use any tool that we can use online such as This nice tool box that maybe we're going to blur out what it's actually doing or who it's from but Anyway, so I'm using an online tool to go do an MX lookup of the domain here And we can see that the MX record for this domain is modern digital office dash com Dot mail dot protection dot outlook dot com that first section of the MX record Before the dot mail dot protection dot outlook dot com that is our domain GUID So in a notepad I've gone and added I'm sorry the domain GUID as Modern digital office comm Another way to find the domain GUID would be to log into the admin portal of office 365 and go to settings domains and selecting the domain that you're looking for in this case modern digital office comm and In the MX record, so this is basically the MX record that Microsoft is recommending that you publish We can see that that value is also here in modern digital office dash com Which brings us to the simple thing The domain GUID almost always is the same as your domain with the period replaced with a dash So in this case for the domain modern digital office comm my domain GUID is modern digital office dash comm We still recommend doing this by going and finding this data through the domain Doing an MX look up for the domain or by going in and looking at the domain settings in office 365 because This isn't true a hundred percent of the time But almost always it is just the domain with a period replaced with a dash The next step would be collecting the initial domain In your office 365 tenant the initial domain is the domain that was created in the tenant when the account was first signed up It is not normally your actual domain, but it may be similar Essentially we go to that same location that we were just at looking at our our actual domain So again under settings domains and your domain. So let me go there real quick So we would find that in the admin center again under under settings Domains and then we can see that we have a domain that is listed here with a dot on Microsoft comm Domain that is our initial domain. So then we would just copy that and we're going to paste that also out here in our little Document where we're collecting all of our useful information that we're going to copy and paste