Hey Lukas, totally get that,deliverability can feel like guesswork sometimes. A good starting point is to check your bounce rates, spam complaint rates, and inbox placement if your ESP provides that. Tools like GlockApps or Mail-Tester can help you see how often your emails hit inboxes vs. spam. Also keep an eye on engagement (opens, clicks),sudden drops can hint at deliverability issues even if everything looks fine on paper.