MAGIC Can you post the whole error message? Also to which server? Google, AWS, T-Online etc? Is your DNS fine? IP maybe blacklisted? Questions over questions
fef MAGIC Can you post the whole error message? Also to which server? Google, AWS, T-Online etc? Is your DNS fine? IP maybe blacklisted? How do i check those things
MAGIC Maybe you created the domain as backup MX. https://mailcow.github.io/mailcow-dockerized-docs/debug-common_problems/#mail-loops-back-to-myself
