diff --git a/spambot.admin.inc b/spambot.admin.inc
index cb311a9..c41a4e3 100644
--- a/spambot.admin.inc
+++ b/spambot.admin.inc
@@ -63,7 +63,26 @@ function spambot_settings_form($form, &$form_state) {
     '#default_value' => variable_get('spambot_blocked_message_ip', t(SPAMBOT_DEFAULT_BLOCKED_MESSAGE)),
     '#description' => t('Message to display when user registration is blocked due to ip address.'),
   );
-  
+
+  $form['contact'] = array(
+    '#type' => 'fieldset',
+    '#title' => t('Contact form'),
+    '#collapsible' => TRUE,
+  );
+  $form['contact']['spambot_contact_site_protect'] = array(
+    '#type' => 'checkbox',
+    '#title' => t('Protect the contact site form'),
+    '#description' => t('If ticked, all feedbacks via the site contact from will be tested if they match any known spammers and blacklisted.'),
+    '#default_value' => variable_get('spambot_contact_site_protect', FALSE),
+  );
+  $form['contact']['spambot_contact_site_protect_message'] = array(
+    '#type' => 'textarea',
+    '#title' => t('User registration blocked message (blocked email address)'),
+    '#description' => t('Message to display when feedback via the site contact from is blocked'),
+    '#default_value' => variable_get('spambot_contact_site_protect_message', t(SPAMBOT_CONTACT_FORM_DEFAULT_BLOCKED_MESSAGE)),
+    '#rows' => 1,
+  );
+
   $sleep_options = array(0 => t('Don\'t delay'), 1 => t('1 second'));
   foreach (array(2, 3, 4, 5, 10, 20, 30) as $num) {
     $sleep_options[$num] = t('@num seconds', array('@num' => $num));
diff --git a/spambot.module b/spambot.module
index bb5054d..5b57de8 100644
--- a/spambot.module
+++ b/spambot.module
@@ -10,6 +10,7 @@ define('SPAMBOT_ACTION_BLOCK', 1);
 define('SPAMBOT_ACTION_DELETE', 2);
 
 define('SPAMBOT_DEFAULT_BLOCKED_MESSAGE', 'Your email address or username or IP address is blacklisted.');
+define('SPAMBOT_CONTACT_FORM_DEFAULT_BLOCKED_MESSAGE', 'You can\'t use the feedback form, because your IP address or email address is blacklisted.');
 
 define('SPAMBOT_MAX_EVIDENCE_LENGTH', 1024);
 
@@ -122,6 +123,45 @@ function spambot_user_register_validate($form, &$form_state) {
 }
 
 /**
+ * Implementation of hook_form_FORM_ID_alter()
+ */
+function spambot_form_contact_site_form_alter(&$form, &$form_state, $form_id) {
+  if (variable_get('spambot_contact_site_protect', FALSE)) {
+    $form['#validate'][] = 'spambot_contact_site_validate';
+  }
+}
+
+/**
+ * Validate the user_register form
+ */
+function spambot_contact_site_validate($form, &$form_state) {
+  $email_threshold = variable_get('spambot_criteria_email', 1);
+  $ip_threshold = variable_get('spambot_criteria_ip', 20);
+
+  // Build request parameters according to the criteria to use
+  $request = array();
+  if (!empty($form_state['values']['mail']) && $email_threshold > 0) {
+    $request['email'] = $form_state['values']['mail'];
+  }
+  if ($ip_threshold > 0) {
+    $ip = ip_address();
+    // Don't check the loopback interface
+    if ($ip != '127.0.0.1') {
+      $request['ip'] = $ip;
+    }
+  }
+
+  $data = array();
+  if (spambot_sfs_request($request, $data)) {
+    if (($email_threshold > 0 && !empty($data['email']['appears']) && $data['email']['frequency'] >= $email_threshold)
+      || ($ip_threshold > 0 && !empty($data['ip']['appears']) && $data['ip']['frequency'] >= $ip_threshold)) {
+
+      form_set_error('', t(variable_get('spambot_contact_site_protect_message', t(SPAMBOT_CONTACT_FORM_DEFAULT_BLOCKED_MESSAGE))));
+    }
+  }
+}
+
+/**
  * Implementation of hook_node_insert
  *
  * Keeps table node_spambot up to date