Hello
try to install RSA and ECDSA, but it's don't run like normal mode. I have note here any steps for integrated this and sign it. Postfix mail_version = 3.4.14 privkey, fullchaine = normal TLS/SSL, RUN and OK Postfix RSA = RSA, Failed Postfix ECC = ECDSA, Failed Generate Certificates..... ./acme.sh --issue -d nmail.caloro.ch --keylength 4096 --standalone ./acme.sh --issue -d nmail.caloro.ch --keylength ec-384 -standalone Als try with certbot, without change. < Main.cf > smtpd_tls_chain_files = /etc/letsencrypt/live/nmail.caloro.ch/privkey.pem, /etc/letsencrypt/live/nmail.caloro.ch/fullchain.pem, /etc/letsencrypt/live/nmail.caloro.ch/postfix-rsa.crt, /etc/letsencrypt/live/nmail.caloro.ch/postfix-rsa.key, /etc/letsencrypt/live/nmail.caloro.ch/postfix_ecc.crt, /etc/letsencrypt/live/nmail.caloro.ch/postfix_ecc.cer < Log > May 30 08:37:05 postfix/smtps/smtpd[27908]: warning: No certs for key at index 1 in /etc/letsencrypt/live/nmail.caloro.ch/postfix-rsa.key /etc/letsencrypt/live/nmail.caloro.ch/postfix_ecc.key May 30 08:37:05 postfix/smtps/smtpd[27908]: warning: error loading private keys and certificates from: /etc/letsencrypt/live/nmail.caloro.ch/privkey.pem, /etc/letsencrypt/live/nmail.caloro.ch/fullchain.pem, /etc/letsencrypt/live/nmail.caloro.ch/postfix-rsa.crt, /etc/letsencrypt/live/nmail.caloro.ch/postfix-rsa.key, /etc/letsencrypt/live/nmail.caloro.ch/postfix_ecc.crt, /etc/letsencrypt/live/nmail.caloro.ch/postfix_ecc.key: disabling TLS support Meny thanks for any possible hint, Maurizio