diff --git a/install.sh b/install.sh
index fe6a9ba..d674162 100755
--- a/install.sh
+++ b/install.sh
@@ -57,10 +57,11 @@ systemctl daemon-reload
 systemctl enable --now letsencrypt-deploy.path
 
 echo
-domain=`hostname -d`
-if [ -n "$domain" ]; then
-  echo "email = webmaster@$domain" >> /etc/letsencrypt/cli.ini
-  echo "Let's Encrypt email set to webmaster@$domain"
+fqdn=`hostname -f`
+if [ -n "$fqdn" ]; then
+  echo "email = webmaster@$fqdn" >> /etc/letsencrypt/cli.ini
+  echo "Let's Encrypt email set to webmaster@$fqdn"
+  echo "This can be changed by editing /etc/letsencrypt/cli.ini."
 else
   echo "Server DNS domain name not set, Let's Encrypt email setting left unconfigured."
 fi