diff --git a/src/func/on_exit b/src/func/on_exit
index 0801b75..59774f1 100755
--- a/src/func/on_exit
+++ b/src/func/on_exit
@@ -4,28 +4,31 @@
 
 #on_exit [error_level]
 function on_exit() {
-	#send log and errorlevel[success/errorr xy]
+  ### send mail
+  [ -n "$log_mail_aim" ] && {
+    #send log and errorlevel[success/errorr xy]
+    if [ "$1" != "0" ]; then
+      log_mail_subject="$log_mail_subject [ERROR]"
+    else
+      log_mail_subject="$log_mail_subject [Success]"
+    fi
 
-	if [ "$1" != "0" ]; then
-		log_mail_subject="$log_mail_subject [ERROR]"
-	else
-		log_mail_subject="$log_mail_subject [Success]"
-	fi
+    #Mail Body:
+    for mail_aim in `echo "$log_mail_aim" | tr "," " "`; do
+      {
+        echo "$log_mail_subject"
+        echo $'####################################################################################\n\n'
+        cat "$log_file"
+      } | sendemail -s "$log_mail_smtp" -f "$log_mail_source" -t "$mail_aim" -u "$log_mail_subject" -o tls=no
+    done
+  }
 
-	#Mail Body:
-	for mail_aim in `echo "$log_mail_aim" | tr "," " "`; do
-		{
-			echo "$log_mail_subject"
-			echo $'####################################################################################\n\n'
-			cat "$log_file"
-		} | sendemail -s "$log_mail_smtp" -f "$log_mail_source" -t "$mail_aim" -u "$log_mail_subject" -o tls=no
-	done
-
-	[ "$1" != "0" ] && {
-		chroot_umount$distro "$chroot_path" 2> /dev/null
-		workspace_erase "$iso_extr_dir/" "$chroot_path/" 2> /dev/null
-	}
-	exit $1
+  ### clean up
+  [ "$1" != "0" ] && {
+    chroot_umount$distro "$chroot_path" 2> /dev/null
+    workspace_erase "$iso_extr_dir/" "$chroot_path/" 2> /dev/null
+  }
+  exit $1
 }
 
 #this func is standalone executable