diff --git a/src/app/code/community/Zendesk/Zendesk/Model/Api/Requesters.php b/src/app/code/community/Zendesk/Zendesk/Model/Api/Requesters.php
index 195a013f..f9f94216 100644
--- a/src/app/code/community/Zendesk/Zendesk/Model/Api/Requesters.php
+++ b/src/app/code/community/Zendesk/Zendesk/Model/Api/Requesters.php
@@ -19,7 +19,7 @@ class Zendesk_Zendesk_Model_Api_Requesters extends Zendesk_Zendesk_Model_Api_Use
 {
     public function create($email, $name = null)
     {
-        if(!Zend_Validate::is($email, 'EmailAddress')) {
+        if(!Zend_Validate::is($email, 'EmailAddress', array('domain' => false))) {
             throw new InvalidArgumentException('Invalid email address provided');
         }
 
diff --git a/src/app/code/community/Zendesk/Zendesk/Model/Api/Users.php b/src/app/code/community/Zendesk/Zendesk/Model/Api/Users.php
index 63ef4f8f..780ee786 100644
--- a/src/app/code/community/Zendesk/Zendesk/Model/Api/Users.php
+++ b/src/app/code/community/Zendesk/Zendesk/Model/Api/Users.php
@@ -19,7 +19,7 @@ class Zendesk_Zendesk_Model_Api_Users extends Zendesk_Zendesk_Model_Api_Abstract
 {
     public function find($email)
     {
-        if(!Zend_Validate::is($email, 'EmailAddress')) {
+        if(!Zend_Validate::is($email, 'EmailAddress', array('domain' => false))) {
             throw new InvalidArgumentException('Invalid email address provided');
         }
 
diff --git a/src/app/code/community/Zendesk/Zendesk/Model/Observer.php b/src/app/code/community/Zendesk/Zendesk/Model/Observer.php
index 30559d9c..f044d07a 100644
--- a/src/app/code/community/Zendesk/Zendesk/Model/Observer.php
+++ b/src/app/code/community/Zendesk/Zendesk/Model/Observer.php
@@ -80,7 +80,7 @@ public function saveConfig(Varien_Event_Observer $observer)
             // If the email is already set, then do nothing
             if($currentEmail !== $zendeskEmail) {
                 // Ensure the email address value exists and is valid
-                if(Zend_Validate::is($zendeskEmail, 'EmailAddress')) {
+                if(Zend_Validate::is($zendeskEmail, 'EmailAddress', array('domain' => false))) {
                     Mage::getModel('core/config')->saveConfig('zendesk/hidden/contact_email_old', $currentEmail, $scope, $scopeId);
                     Mage::getModel('core/config')->saveConfig('contacts/email/recipient_email', $zendeskEmail, $scope, $scopeId);
                 }
diff --git a/src/app/code/community/Zendesk/Zendesk/controllers/ApiController.php b/src/app/code/community/Zendesk/Zendesk/controllers/ApiController.php
index 0b32493e..4b2768cc 100644
--- a/src/app/code/community/Zendesk/Zendesk/controllers/ApiController.php
+++ b/src/app/code/community/Zendesk/Zendesk/controllers/ApiController.php
@@ -359,7 +359,7 @@ public function finaliseAction()
                 // If the email is already set, then do nothing
                 if($currentEmail !== $zendeskEmail) {
                     // Ensure the email address value exists and is valid
-                    if(Zend_Validate::is($zendeskEmail, 'EmailAddress')) {
+                    if(Zend_Validate::is($zendeskEmail, 'EmailAddress', array('domain' => false))) {
                         Mage::getModel('core/config')->saveConfig('zendesk/hidden/contact_email_old', $currentEmail);
                         Mage::getModel('core/config')->saveConfig('contacts/email/recipient_email', $zendeskEmail);
                     }