[tiberious726]

I set up my orgs SPF/DKIM/DMARC (we self host, they have feelings about corporate data sovereignity...) it look about 30 min having never touched them before, and maybe another 15 to write an ansible playbook to rotate the keys.

We do have a _tremendous_ amount of spam fail these checks, as well as a few legitimate organizations.... Some of our peer companies have sent out notices that they will bounce anything that fail these checks in the coming years, and we're probably going to to do the same before too long.

It's trivially easy, and absolutely valuable