saving uncommitted changes in /etc prior to dnf run

postfix/master.cf

@@ -16,7 +16,7 @@ smtp_enforced_tls      unix  -       -       n       -       -       smtp
   -o syslog_name=enforced-tls-smtp
   #-o smtp_delivery_status_filter=pcre:/etc/postfix/smtp_dsn_filter
 
-smtp      inet  n       -       n       -       -       smtpd
+#smtp      inet  n       -       n       -       -       smtpd
 #   #-o content_filter=spamcheck:dummy
 #   -o receive_override_options=no_address_mappings
 #   #-o content_filter=spamfilter:dummy
@@ -25,19 +25,6 @@ smtp      inet  n       -       n       -       -       smtpd
         -o smtpd_tls_wrappermode=yes
         -o smtpd_sasl_auth_enable=yes
         -o smtpd_client_restrictions=permit_sasl_authenticated,reject
-
-## Enable SMTP on port 587 only for authenticated/TLS clients
-submission inet n       -       n       -       -       smtpd
-	-o smtpd_enforce_tls=yes
-    -o smtpd_tls_security_level=may
-	-o smtpd_sasl_auth_enable=yes
-	-o smtpd_client_restrictions=permit_sasl_authenticated,reject
-
-## Enable SMTP on port 465 only for authenticated/SSL clients
-smtps     inet  n       -       n       -       -       smtpd
-	-o smtpd_tls_wrappermode=yes
-	-o smtpd_sasl_auth_enable=yes
-	-o smtpd_client_restrictions=permit_sasl_authenticated,reject
 #
 pickup    fifo  n       -       n       60      1       pickup
 	-o content_filter=