Our Email Provider Banned Us Overnight -- Here's What We Learned

April 6, 2026 | 8 min read We woke up on a Tuesday morning to find that every single email our products sent -- password resets, welcome messages, subscription confirmations, grading notifications -- was bouncing. Not some of them. All of them. Our email provider had permanently disabled our account overnight, with no warning and no appeal process. Just a single-line notification: "Your account has been suspended due to policy violations." We are a small group of friends from Tennessee building SaaS products under our company, Obsidian Clad Labs. We run five live products, and every one of them depends on transactional email to function. This was not an inconvenience. It was a full-blown emergency. Here is what happened, what we did wrong, and what we learned so you do not make the same mistakes. What Actually Happened The root cause was embarrassingly simple. One of our team members had been doing outreach -- cold emails to potential users we thought might benefit from one of our prod