diff --git a/modules/contact/contact.pages.inc b/modules/contact/contact.pages.inc
index ba8918b..fcca290 100644
--- a/modules/contact/contact.pages.inc
+++ b/modules/contact/contact.pages.inc
@@ -76,6 +76,25 @@ function contact_site_form($form, &$form_state) {
     '#default_value' => $user->uid ? $user->mail : '',
     '#required' => TRUE,
   );
+
+  // Do not allow authenticated users to alter the name or e-mail values to
+  // prevent the impersonation of other users.
+  if ($user->uid){
+    // Change form elements to values.
+    $form['name']['#type'] = $form['mail']['#type'] = 'value';
+
+    // Display read-only name and e-mail address to the user.
+    $form['name_display'] = array(
+      '#type' => 'item',
+      '#title' => t('Your name'),
+      '#markup' => format_username($user),
+    );
+    $form['mail_display'] = array(
+      '#type' => 'item',
+      '#title' => t('Your e-mail address'),
+      '#markup' => $user->mail,
+    );
+  }
   $form['subject'] = array(
     '#type' => 'textfield',
     '#title' => t('Subject'),
@@ -95,8 +114,8 @@ function contact_site_form($form, &$form_state) {
     '#title' => t('Message'),
     '#required' => TRUE,
   );
-  // We do not allow anonymous users to send themselves a copy
-  // because it can be abused to spam people.
+  // Do not allow anonymous users to send themselves a copy because it can be
+  // abused to spam people.
   $form['copy'] = array(
     '#type' => 'checkbox',
     '#title' => t('Send yourself a copy.'),
@@ -141,6 +160,7 @@ function contact_site_form_submit($form, &$form_state) {
 
   // Save the anonymous user information to a cookie for reuse.
   if (!$user->uid) {
+    $values['sender']->name .= ' (' . t('Unverified') . ')';
     user_cookie_save(array_intersect_key($values, array_flip(array('name', 'mail'))));
   }
 
@@ -218,6 +238,25 @@ function contact_personal_form($form, &$form_state, $recipient) {
     '#default_value' => $user->uid ? $user->mail : '',
     '#required' => TRUE,
   );
+
+  // Do not allow authenticated users to alter the name or e-mail values to
+  // prevent the impersonation of other users.
+  if (!empty($user->uid)){
+    // Change form elements to values.
+    $form['name']['#type'] = $form['mail']['#type'] = 'value';
+
+    // Display read-only name and e-mail address to the user.
+    $form['name_display'] = array(
+      '#type' => 'item',
+      '#title' => t('Your name'),
+      '#markup' => format_username($user),
+    );
+    $form['mail_display'] = array(
+      '#type' => 'item',
+      '#title' => t('Your e-mail address'),
+      '#markup' => $user->mail,
+    );
+  }
   $form['to'] = array(
     '#type' => 'item',
     '#title' => t('To'),
@@ -235,7 +274,7 @@ function contact_personal_form($form, &$form_state, $recipient) {
     '#rows' => 15,
     '#required' => TRUE,
   );
-  // We do not allow anonymous users to send themselves a copy
+  // Do not allow anonymous users to send themselves a copy
   // because it can be abused to spam people.
   $form['copy'] = array(
     '#type' => 'checkbox',
@@ -276,6 +315,7 @@ function contact_personal_form_submit($form, &$form_state) {
 
   // Save the anonymous user information to a cookie for reuse.
   if (!$user->uid) {
+    $values['sender']->name .= ' (' . t('Unverified') . ')';
     user_cookie_save(array_intersect_key($values, array_flip(array('name', 'mail'))));
   }
 
diff --git a/modules/contact/contact.test b/modules/contact/contact.test
index 48c8bb0..6c56cfb 100644
--- a/modules/contact/contact.test
+++ b/modules/contact/contact.test
@@ -161,6 +161,20 @@ class ContactSitewideTestCase extends DrupalWebTestCase {
   }
 
   /**
+   * Tests that name and email fields are not present for authenticated users.
+   */
+  function testContactSiteWideTextfieldsLoggedInTestCase() {
+    $this->drupalLogin($this->drupalCreateUser(array('access site-wide contact form')));
+    $this->drupalGet('contact');
+
+    // Ensure that there is no textfield for name.
+    $this->assertFalse($this->xpath('//input[@name=:name]', array(':name' => 'name')));
+
+    // Ensure that there is no textfield for email.
+    $this->assertFalse($this->xpath('//input[@name=:name]', array(':name' => 'mail')));
+  }
+
+  /**
   * Tests auto-reply on the site-wide contact form.
   */
   function testAutoReply() {
@@ -175,6 +189,10 @@ class ContactSitewideTestCase extends DrupalWebTestCase {
     $this->addCategory('bar', 'bar@example.com', $bar_autoreply, FALSE);
     $this->addCategory('no_autoreply', 'bar@example.com', '', FALSE);
 
+    // Log the current user out in order to test the name and e-mail fields.
+    $this->drupalLogout();
+    user_role_grant_permissions(DRUPAL_ANONYMOUS_RID, array('access site-wide contact form'));
+
     // Test the auto-reply for category 'foo'.
     $email = $this->randomName(32) . '@example.com';
     $subject = $this->randomName(64);