In the past I have deployed TKLX servers using a manually obtained SSL certificate which I then upload and embed in the appropriate configuration files (apache, webmin, stunnel, postfix).
I deployed my first LetsEncrypt server (version 15) and it works fine for the apache server out of the box but I didn't get around to converting my postfix server from direct to relay until now...and I realise I don't know how to go about ensuring the renewed LetsEncrypt cert automatically gets applied into my postfix server configuration for relayed email.
Can you clarify which TKLX appliance features from