Microsoft Warns Misconfigured Email Routing Can Enable Internal Domain Phishing

Microsoft Screams “Stop Screwing Up Your Email Configs” — But You Won’t Listen

Well, surprise, surprise — Microsoft’s waving another big red flag because companies keep proving they can’t configure a mail server without turning it into a phishing buffet. Apparently, some geniuses have left their email routing so wide open that internal domain spoofing is basically a freakin’ feature now. You know, the kind where some punk sends “totally legit” emails from inside your own goddamn organization.

Microsoft’s basically saying, “Hey morons, maybe check your inbound connectors and mail flow rules before your CFO wires the company funds to some Nigerian prince wearing your logo.” The issue? Misconfigured routing between Microsoft Exchange Online and external mail systems. Because apparently half the IT world thinks SPF, DKIM, and DMARC are a set of IKEA furniture rather than critical email security controls.

This little misconfiguration fiesta lets attackers bypass protections and trick users into thinking those juicy scam emails are actually from your CEO, probably asking for a wire transfer “ASAP because I’m in a meeting, Karen.” Microsoft’s advice? Use security headers properly, verify your custom routing, and stop being lazy-ass sysadmins who treat DNS records like witchcraft.

But let’s be honest, the people causing this mess are the same ones who still think “password123” is fine because “we’re behind a firewall.” Strap in for another few billion dollars in phishing losses, folks. Evolution has clearly taken a sick day in IT departments worldwide.

Microsoft even dropped a list of remediation tips, but let’s face it — nobody’s going to read them until they’re halfway through an incident report titled “Why the CFO Sent $2M to Not-Actually-Bob.”

Read the full digital facepalm here: https://thehackernews.com/2026/01/microsoft-warns-misconfigured-email.html

— Once had a client who insisted their mail server was “unhackable.” Turns out, it was open relay, running on a Windows box with RDP wide open, password was “P@ssw0rd”. Took five minutes to get in, two hours to stop laughing.

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