i am using lets-encrypt-certs for my mailserver and clients.
A special email-client “The Bat” needs the Lets-encrypt Root-Certificate to trust the cert.
So i manually need to download “DSTRootCAX3.crt” and put it into the chain.
The problem is, that on auto-renewing by certbot, this needs to be done manually after the cronjob.
How can i automatically let the Root-Cert be inserted by certbot on renewing?