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the mailprotector engineering blog

HELO, world

Field notes from the people building email security at Mailprotector. How we get the good mail through, stop the bad, and keep a few decades of SMTP running, including the long nights that come with it.

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port 25 — session
·8 min read
PhishingZero Trust

If phishing simulations work, why do they need a mandate?

Phishing simulations produce compliance artifacts, and that's why they persist even though they don't protect users. The technical case for moving the trust decision off the content an attacker controls.

Ben Hathaway

Chief Technology Officer

·10 min read
PostmortemExchangeMicrosoft 365Deliverability

How Microsoft 365 decides which tenant email belongs to

A new mail-flow rollout made Microsoft 365 attribute every customer's mail to our tenant. The undocumented rule behind it, and the fix.

Mailprotector

Engineering Team

·3 min read
SMTP

HELO, world!

Why an email security company is starting an engineering blog, and what we plan to put here.

Ben Hathaway

Chief Technology Officer

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