Trying to send a secured email via OX results in:
A Guard server error occurred with HTTP status code 500. Error message: GRD-NOT-0001: An unexpected error occurred while trying to send an email: Could not convert socket to TLS
For your information: I am using my own certificate which is installed according (Using your own SSL certificates).
openssl verify /etc/myssl/cert.pem /etc/myssl/cert.pem: OK