diff --git a/email_verify.inc.php b/email_verify.inc.php
index 19ae6aa..9834c7a 100644
--- a/email_verify.inc.php
+++ b/email_verify.inc.php
@@ -4,10 +4,29 @@
  * Check the email for email_verify module.
  */
 
+ /*
+ *  Manage cache before calling internal verification function.
+ */ 
+function _email_verify_check($mail, $use_caching = FALSE) {
+  $cache_key = 'email_block_' . $mail;
+  if ($use_caching && $cache = cache_get($cache_key, 'cache_email_verify')) {
+    // Log to watchdog.
+    watchdog('email_verify', t('Cached verification: @error', array('@error' => $cache->data)));
+    return $cache->data;
+  }
+  else {
+    $result = _email_verify_check_internal($mail);
+    if (!empty($result)) {
+      cache_set($cache_key, $result, 'cache_email_verify', CACHE_TEMPORARY);
+    }
+    return $result;
+  }
+}
+ 
 /**
  * Checks the email address for validity.
  */
-function _email_verify_check($mail) {
+function _email_verify_check_internal($mail) {
   if (!valid_email_address($mail)) {
     // The address is syntactically incorrect.
     // The problem will be caught by the 'user' module anyway, so we avoid
diff --git a/email_verify.module b/email_verify.module
index 50acb1b..97b0a7d 100644
--- a/email_verify.module
+++ b/email_verify.module
@@ -86,7 +86,7 @@ function email_verify_form_contact_personal_form_alter(&$form, &$form_state, $fo
  */
 function email_verify_edit_validate($form, &$form_state) {
   // Validate the e-mail address:
-  if ($error = email_verify_check($form_state['input']['mail'])) {
+  if ($error = email_verify_check($form_state['input']['mail'], TRUE)) {
     form_set_error('mail', $error);
   }
 }
@@ -101,7 +101,7 @@ function email_verify_edit_validate($form, &$form_state) {
  *   NULL if the address exists, or an error message if we found a problem with
  *   the address.
  */
-function email_verify_check($mail) {
+function email_verify_check($mail, $cache_response = FALSE) {
   include_once DRUPAL_ROOT . '/' . drupal_get_path('module', 'email_verify') . '/email_verify.inc.php';
-  return _email_verify_check($mail);
+  return _email_verify_check($mail, $cache_response);
 }