Physician, heal thyself: Even I can get auth wrong!

Here is a fresh slice of humble pie: even after years of advising senders on authentication protocols and email best practices, I managed to break my own newsletter's SPF record last week. I try to practice what I preach. My newsletter list is 100% double opt-in, no spam here, and I’ve got just about every auth protocol covered – SPF, DKIM, DMARC and BIMI. All in place, all passing, all correct.…