Postmortem 5 min read A slow TLS handshake jammed our whole outbound queue One destination's mail server stopped finishing its TLS handshakes. Because of a timeout we'd set in the wrong place, that was enough to back up delivery for everyone. BH Ben Hathaway May 28, 2026
Testing 4 min read Testing a mail server means lying to it convincingly Our test suite spends most of its effort pretending to be badly behaved senders. Here's how we fake the rest of the internet on a laptop. TM The Mailprotector Team May 23, 2026
Meta 3 min read HELO, world Why a company that moves email for a living is starting an engineering blog, and what we plan to put here. BH Ben Hathaway May 18, 2026