Can't help but feel a little Schadenfreude here.
One of our e-mail customers is moving to Microsoft Office365, much to the chagrin on the technical guy with whom I moved everything to our platform last year. Not because our mailplatform didn't work the way they wanted, but because a few people in their company wanted everything integrated: mail, agenda, fileshares, the works. For what I've heard the reasons for that were based solely on "it's easier", the ones who finally forced in onto the rest don't know a lot about how e-mail works.
So, "my" tech guy refused to do this project, and one of the MS fanboys decided to volunteer and did what he thought he should do. But then... mail sent from the MS servers bounced or disappeared into people's spamfolders. He found some documents about this thingy called SPF, but he didn't find Microsoft's own documents that explain how it works and how it should be configured. So he removed the SPF record altogether, which helped a little... Same for DMARC: deleted.
So, I today I got a cry for help (via my tech contact): why is our e-mail marked as spam, what is SPF and how should I configure it?
I helped him with the SPF stuff, I even pointed him at Microsoft's own documentation. Now I'm waiting for a follow-up question: what is DMARC and how should I configure it.
I'm sure I'll be tempted to remind him that everything worked just fine when they used our platform :innocent: