diff --git a/includes/simplenews.admin.inc b/includes/simplenews.admin.inc
index 80002e7..4588f9a 100644
--- a/includes/simplenews.admin.inc
+++ b/includes/simplenews.admin.inc
@@ -725,6 +725,12 @@ function simplenews_subscription_list_add($form, &$form_state) {
     );
   }
 
+  $form['resubscribe'] = array(
+    '#type' => 'checkbox',
+    '#title' => t('Force resubscription'),
+    '#description' => t('If checked, previously unsubscribed e-mail addresses will be resubscribed. Consider that this might be against the will of your users.'),
+  );
+
   // Include language selection when the site is multilingual.
   // Default value is the empty string which will result in receiving emails
   // in the site's default language.
@@ -764,6 +770,7 @@ function simplenews_subscription_list_add($form, &$form_state) {
 function simplenews_subscription_list_add_submit($form, &$form_state) {
   $added = array();
   $invalid = array();
+  $unsubscribed = array();
   $checked_categories = array_keys(array_filter($form_state['values']['newsletters']));
   $langcode = $form_state['values']['language'];
 
@@ -774,10 +781,18 @@ function simplenews_subscription_list_add_submit($form, &$form_state) {
       continue;
     }
     if (valid_email_address($email)) {
+      $subscriber = simplenews_subscriber_load_by_mail($email);
       foreach (simplenews_categories_load_multiple($checked_categories) as $category) {
-
-        simplenews_subscribe_user($email, $category->tid, FALSE, 'mass subscribe', $langcode);
-        $added[] = $email;
+        // If there is a valid subscriber, check if there is a subscription for the current category and if this subscription has the status unsubscribed.
+        $is_unsubscribed = $subscriber && array_key_exists($category->tid, $subscriber->newsletter_subscription)
+              && $subscriber->newsletter_subscription[$category->tid]->status == SIMPLENEWS_SUBSCRIPTION_STATUS_UNSUBSCRIBED;
+        if ( !$is_unsubscribed || $form_state['values']['resubscribe'] == TRUE) {
+          simplenews_subscribe_user($email, $category->tid, FALSE, 'mass subscribe', $langcode);
+          $added[] = $email;
+        }
+        else {
+          $unsubscribed[check_plain(_simplenews_newsletter_name($category))][] = $email;
+        }
       }
     }
     else {
@@ -802,6 +817,19 @@ function simplenews_subscription_list_add_submit($form, &$form_state) {
     drupal_set_message(t('The following addresses were invalid: %invalid.', array('%invalid' => $invalid)), 'error');
   }
 
+  $show_hint = FALSE;
+  foreach ($unsubscribed as $name => $subscribers) {
+    if ( $subscribers ) {
+      $subscribers = implode(", ", $subscribers);
+      drupal_set_message(t('The following addresses were skipped because they have previously unsubscribed from %name: %unsubscribed.', array('%name' => $name, '%unsubscribed' => $subscribers)), 'warning');
+      $show_hint = TRUE;
+    }
+  }
+
+  if ($show_hint) {
+    drupal_set_message(t("If you would like to resubscribe them, use the 'Force resubscription' option."), 'warning');
+  }
+
   // Return to the parent page.
   $form_state['redirect'] = 'admin/people/simplenews';
 }
diff --git a/tests/simplenews.test b/tests/simplenews.test
index bc459f1..ff802ed 100644
--- a/tests/simplenews.test
+++ b/tests/simplenews.test
@@ -1437,6 +1437,46 @@ class SimpleNewsAdministrationTestCase extends SimplenewsTestCase {
     $after_count = simplenews_count_subscriptions($first);
     $this->assertEqual($before_count - 1, $after_count, t('Blocked users are not counted in subscription count.'));
 
+    // Test mass subscribe with previously unsubscribed users.
+    for ($i = 0; $i < 3; $i++) {
+      $tested_subscribers[] = $this->randomEmail();
+    }
+    simplenews_subscribe_user($tested_subscribers[0], $first, FALSE);
+    simplenews_subscribe_user($tested_subscribers[1], $first, FALSE);
+    simplenews_unsubscribe_user($tested_subscribers[0], $first, FALSE);
+    simplenews_unsubscribe_user($tested_subscribers[1], $first, FALSE);
+    $unsubscribed = implode(', ', array_slice($tested_subscribers, 0, 2));
+    $edit = array(
+      'emails' => implode(', ', $tested_subscribers),
+      'newsletters[' . $first . ']' => TRUE,
+    );
+
+    $this->drupalPost('admin/people/simplenews/import', $edit, t('Subscribe'));
+    drupal_static_reset('simplenews_subscriber_load_multiple');
+    drupal_static_reset('simplenews_user_is_subscribed');
+    $this->assertFalse(simplenews_user_is_subscribed( $tested_subscribers[0], $first, t('Subscriber not resubscribed through mass subscription.')));
+    $this->assertFalse(simplenews_user_is_subscribed( $tested_subscribers[1], $first, t('Subscriber not resubscribed through mass subscription.')));
+    $this->assertTrue(simplenews_user_is_subscribed( $tested_subscribers[2], $first, t('Subscriber subscribed through mass subscription.')));
+    $substitutes = array('@name' => check_plain(_simplenews_newsletter_name(simplenews_category_load($first))), '@mail' => $unsubscribed);
+    $this->assertText(t('The following addresses were skipped because they have previously unsubscribed from @name: @mail.', $substitutes));
+    $this->assertText(t("If you would like to resubscribe them, use the 'Force resubscription' option."));
+
+
+    // Test mass subscribe with previously unsubscribed users and force resubscription.
+    $tested_subscribers[2] = $this->randomEmail();
+    $edit = array(
+      'emails' => implode(', ', $tested_subscribers),
+      'newsletters[' . $first . ']' => TRUE,
+      'resubscribe' => TRUE,
+    );
+
+    $this->drupalPost('admin/people/simplenews/import', $edit, t('Subscribe'));
+    drupal_static_reset('simplenews_subscriber_load_multiple');
+    drupal_static_reset('simplenews_user_is_subscribed');
+    $this->assertTrue(simplenews_user_is_subscribed( $tested_subscribers[0], $first, t('Subscriber resubscribed trough mass subscription.')));
+    $this->assertTrue(simplenews_user_is_subscribed( $tested_subscribers[1], $first, t('Subscriber resubscribed trough mass subscription.')));
+    $this->assertTrue(simplenews_user_is_subscribed( $tested_subscribers[2], $first, t('Subscriber subscribed trough mass subscription.')));
+
     // Delete newsletter category.
     $this->drupalPost('taxonomy/term/' . $first . '/edit', array(), t('Delete'));
     $this->assertText(t('This taxonomy term is part of simplenews newsletter category @name. Deleting this term will delete the newsletter category and all subscriptions to category @name. This action cannot be undone.', array('@name' => $categories[$first]->name)), t('Confirmation message displayed.'));
@@ -1499,7 +1539,6 @@ class SimpleNewsAdministrationTestCase extends SimplenewsTestCase {
     drupal_static_reset('simplenews_user_is_subscribed');
     $this->assertFalse(simplenews_user_is_subscribed($subscriber->mail, reset($subscriber->tids), t('Subscriber not subscribed anymore.')));
 
-
     // @todo Test Admin subscriber edit preferred language $subscription->language
   }