Dear author:

Do NOT ship your first draft!

This piece is a great example of writing smells - you do a disservice to humanity by leaving such important information typed up so awfully.

For instance. "This matters" is a writing smell that stinks to high heaven. Just like code smells - hints that something is off about the code. Can't quite tell something is wrong but you don't like it. Spider sense tingling. Same for bad writing - there are huge signposts you can easily rip out.

If you had to tell us a thing matters you've made TWO MISTAKES. One, you left in whatever it was that didn't matter, so now you gotta tell people hey ignore that stuff! Look at this stuff over here! - and two, you also left in the assertion that this or that thing matters! Delete the shit that didn't matter, then delete the assertion that the thing that matters matters! Poof! Gone! See how nicely it reads now? Spend those 10 words elsewhere with a better payoff.

Smelly writing is no fun to read, and it's rude to ship your first draft.

> Every email carries two "from" addresses

I made a presentation about exactly the same subject many-many years ago, but I was not shy of separating the SMTP protocol (RFC 821 and the following ) and the email message (RFC 822 and the following).

It makes the link between SPF, DKIM and DMARC much clearer.

Anyway. The article covers just the bare minimum, and in the most obscure way.

For those interested in the inner workings of contemporary email delivery... I recommend the posts by Alex Shakhov on LinkedIn https://www.linkedin.com/in/alexshakhov/ (Yes, there is still meaningful content on LinkedIn, it's just vanishingly rare)