Replace MTA GUI Certificate

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Replace certificate

1. Copy the new certificate files as <certificate>.crt (certificate) and <private_key>.key (private key) into the folder /etc/xorlab/tls.
2. Execute the following commands to change the file names and permissions:
   cd /etc/xorlab/tls
   sudo cp <private_key>.key rproxy.key
   sudo cp <certificate>.crt rproxy.crt
   sudo chmod 400 rproxy.key
   sudo chmod 644 rproxy.crt
   sudo chown 2050:2050 rproxy.key
   sudo chown 2050:2050 rproxy.crt
   
3. Reload the reverse proxy to use the new certificate:
   docker exec rproxy_rproxy nginx -s reload
   
4. Verify the certificate using openssl c_client:
   openssl s_client -showcerts -servername <mta_server_name> -connect <mta_server_name>:8443 </dev/null