I work with SPF and DMARC, and still learned things from this recent post on HN.

https://simonandrews.ca/articles/how-to-set-up-spf-dkim-dmar... and https://news.ycombinator.com/item?id=39712634

It honestly isn't that bad, but it falls into that kind of thing you do once a year and then forget in between. Don't let that stuff discourage you, you'll have much bigger problems with humanity on a mailing list unless you commit to really keeping on top of the community.