I understand that you followed the installation guide at bennetrichter.de Icon Tutorial: How to Install and Configure Mailcow (Mail Server) - Bennet Richter

to set up Mailcow with self-signed TLS certificates. However, you want to replace the self-signed certificates with Certbot certificates to avoid the browser warnings. When you copied the Certbot certificates to the /opt/mailcow-dockerized/data/assets/ssl directory, the Mailcow instance still seems to be using its original self-signed certificates.

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