DKIM Selectors and Keys: The Part Most Never Touch Again
How DKIM selectors work, why records under different selectors behave differently, and what key rotation actually involves.
Email Authentication
Moving From DMARC none to reject, Safely
The staged path from monitoring to enforcement that locks out spoofers without locking out your own invoices.
SPF Records: Includes and the Ten-Lookup Limit
How SPF records actually work, why they break when they grow too large, and how to build one from scratch, safely.
SPF, DKIM, DMARC: Authentication Minus the Jargon
What SPF, DKIM and DMARC actually do, why the major inbox providers made them mandatory, and how to check your own domain in seconds.
Those Daily DMARC Emails, Decoded
DMARC aggregate reports are the most underrated deliverability diagnostic you have. Here is how to read them without wading through raw XML.