Here's a cool tool that a colleague at Valimail created recently, and if you care about protecting against people spoofing your emails through lookalike domains, I think you might find it i…
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A few months ago, I posted about " SPF Lockdown ," a simple way to use an SPF (sender policy framework) DNS record to tell the world that a given domain sends no mail. …
I've been asked this question pretty regularly: How do I tell the world that a certain domain of mine isn't valid for sending email? What about typo domains, bad domains?…
RRVS (the Require-Recipient-Valid-Since Header Field) as documented in RFC 7293 seems like a neat idea. It was designed by Yahoo and Facebook folks with the best of intentions.…
