Does it help to reconfigure the mail app in the mail settings by saving the configuration?
Did you request a lets encrypt certificate or upload a certificate?
Were there errors in the logs?
To check the used certificate from a client:
echo | openssl s_client -connect mail.domain.tld:465 -brief
The certificate used by the NS8 mail server is located in /home/mail1/.config/state/tls-certs
The certificates (custom/letsencrypt) are created/uploaded in traefik.
To enter the traefik1 instance:
runagent -m traefik1
Letsencrypt certs are stored in acme/acme.json and uploaded certs in custom-certificates/
Podman supports rootless containers. They’re running as user which is a security improvement.
Show traefik containers:
runagent -m traefik1 podman ps
Show mail containers:
runagent -m mail1 podman ps