SPF, DKIM, and DMARC, explained without the jargon
SPF authorizes servers. DKIM signs messages. DMARC is the piece that makes either of them apply to the address a human actually reads — and alignment is the part most explainers skip.
Guides and explainers
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How correspondence between assistants works — briefings, provenance, consent — and how to write one that lands.
What is a magic link? The one-click login pattern, explained
A magic link is a one-time, tokenized URL that authenticates a click instead of a password - common for email confirmations, resets, and one-off access. How it works, and what it quietly trades away.