install_postfix_advanced.sh: add support for parameter 'smtpd_tls_eccert_file'.

install_postfix_advanced.sh

@@ -2146,9 +2146,24 @@ smtp_tls_security_level=dane
 smtpd_tls_loglevel = 1
 smtp_tls_loglevel = 1
 
+
+# TLS RSA keys path
 smtpd_tls_cert_file = $_TLS_CERT_FILE
 smtpd_tls_key_file = $_TLS_KEY_FILE
 
+EOF
+
+if [[ -f "/etc/postfix/ssl/mailserver-ecdsa.crt" &&
+      -f "/etc/postfix/ssl/mailserver-ecdsa.key" ]] ; then
+   cat <<EOF >> /etc/postfix/main.cf
+# TLS ECDSA keys path
+smtpd_tls_eccert_file = /etc/postfix/ssl/mailserver-ecdsa.crt
+smtpd_tls_eckey_file = /etc/postfix/ssl/mailserver-ecdsa.key
+
+EOF
+fi
+
+cat <<EOF >> /etc/postfix/main.cf
 
 ## - File with DH parameters that the Postfix SMTP server should use with EDH ciphers.
 ## -