diff --git a/deploy_vm.sh b/deploy_vm.sh
index 88803e0..01a584c 100755
--- a/deploy_vm.sh
+++ b/deploy_vm.sh
@@ -92,8 +92,8 @@ fi
 
 echo "INFO : Check USER_MAIL param format..."
 # Check USER_MAIL
-if [[ ! "${USER_MAIL}" =~ ^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,4}$ ]]; then
-        echo 'ERROR : Email address is invalid'
+if [[ ! "${USER_MAIL}" =~ ^(.*)+@(.*)$ ]]; then
+        echo 'ERROR: Email address is invalid'
         exit 1
 fi