Local StartTLS not working

[Aurel004]

Hi,

I have a setup where email-oauth2-proxy is running in a container and clients are talking to it from other containers.
I use Traefik to redirect mydomain.com:1587 to the IP of email-oauth2-proxy.

It is working well but as they are not running on the same machine, plain email text is sent through local network, so I want to use local_starttls = True

I've edited the Traefik config to passthrough TLS to the oauth2-proxy.
Oauth2-proxy has the cert and key using local_certificate_path and local_key_path (did ls -l and read attributes are fine)

In the logs, I can see "Client connected" but it is not sending back the handshake resulting in an error (Time out) on the client side

What am I doing wrong ?

Thank you