Added IPv6 support prompt and domain input incase /etc/mailname is empty

emailwiz.sh

@@ -17,20 +17,28 @@
 
 umask 0022
 
-apt-get install -y postfix postfix-pcre dovecot-imapd dovecot-pop3d dovecot-sieve opendkim opendkim-tools spamassassin spamc net-tools fail2ban bind9-host
-domain="$(cat /etc/mailname)"
+apt install -y postfix postfix-pcre dovecot-imapd dovecot-pop3d dovecot-sieve opendkim opendkim-tools spamassassin spamc net-tools fail2ban bind9-host
+domain="$(< /etc/mailname || read -p 'Domain: ' domain && printf $domain)"
 subdom=${MAIL_SUBDOM:-mail}
 maildomain="$subdom.$domain"
 certdir="/etc/letsencrypt/live/$maildomain"
 
+read -p 'Enable IPv6 support? (Y/n) ' v6choice
+
 # Preliminary record checks
 ipv4=$(host "$domain" | grep -m1 -Eo '([0-9]+\.){3}[0-9]+')
 [ -z "$ipv4" ] && echo "\033[0;31mPlease point your domain ("$domain") to your server's ipv4 address." && exit 1
-ipv6=$(host "$domain" | grep "IPv6" | awk '{print $NF}')
-[ -z "$ipv6" ] && echo "\033[0;31mPlease point your domain ("$domain") to your server's ipv6 address." && exit 1
+case "$v6choice" in
+  [nN]) ;;
+  *)
+    ipv6=$(host "$domain" | grep "IPv6" | awk '{print $NF}')
+    [ -z "$ipv6" ] && { printf "\033[0;31mPlease point your domain (%s) to your server's IPv6 address.\033[0m\n" "$domain"; exit 1; }
+    ;;
+esac
 
 # Open required mail ports, and 80, for Certbot.
-for port in 80 993 465 25 587 110 995; do
+for port in 80 993 465 25 587 110 995
+do
 	ufw allow "$port" 2>/dev/null
 done
 
@@ -213,7 +221,7 @@ service auth {
 	mode = 0660
 	user = postfix
 	group = postfix
-}
+  }
 }
 
 protocol lda {