diff --git a/includes/simplenews.mail.inc b/includes/simplenews.mail.inc
index d05758f..f3eaede 100644
--- a/includes/simplenews.mail.inc
+++ b/includes/simplenews.mail.inc
@@ -224,6 +224,7 @@ function simplenews_mail_spool($limit = SIMPLENEWS_UNLIMITED, array $conditions
     simplenews_impersonate_user(drupal_anonymous_user());
 
     $count_fail = $count_success = 0;
+    $sent = array();
 
     _simplenews_measure_usec(TRUE);
 
@@ -240,6 +241,12 @@ function simplenews_mail_spool($limit = SIMPLENEWS_UNLIMITED, array $conditions
         simplenews_update_spool(array($msid), $row_result);
         if ($row_result['status'] == SIMPLENEWS_SPOOL_DONE) {
           $count_success++;
+          if (!isset($sent[$row->actual_nid])) {
+            $sent[$row->actual_nid] = 1;
+          }
+          else {
+            $sent[$row->actual_nid]++;
+          }
         }
         if ($row_result['error']) {
           $count_fail++;
@@ -267,12 +274,28 @@ function simplenews_mail_spool($limit = SIMPLENEWS_UNLIMITED, array $conditions
       simplenews_update_spool(array($msid), $row_result);
       if ($row_result['status'] == SIMPLENEWS_SPOOL_DONE) {
         $count_success++;
+        if (isset($row->actual_nid)) {
+          if (!isset($sent[$row->actual_nid])) {
+            $sent[$row->actual_nid] = 1;
+          }
+          else {
+            $sent[$row->actual_nid]++;
+          }
+        }
       }
       if ($row_result['error']) {
         $count_fail++;
       }
     }
 
+    // Update subscriber count.
+    foreach ($sent as $nid => $count) {
+      db_update('simplenews_newsletter')
+        ->condition('nid', $nid)
+        ->expression('sent_subscriber_count', 'sent_subscriber_count + :count', array(':count' => $count))
+        ->execute();
+    }
+
     // Report sent result and elapsed time. On Windows systems getrusage() is
     // not implemented and hence no elapsed time is available.
     if (function_exists('getrusage')) {
diff --git a/simplenews.install b/simplenews.install
index 03caf85..3bddae9 100644
--- a/simplenews.install
+++ b/simplenews.install
@@ -854,4 +854,40 @@ function simplenews_update_7008() {
       'default' => '',
     ));
   }
+}
+
+/**
+ * Add the sent_subsriber_countcolumn to {simplenews_newsletter} if missing.
+ */
+function simplenews_update_7009() {
+  if (!db_field_exists('simplenews_newsletter', 'sent_subscriber_count')) {
+    db_add_field('simplenews_newsletter', 'sent_subscriber_count', array(
+      'description' => 'The count of subscribers to the newsletter when it was sent.',
+      'type' => 'int',
+      'not null' => TRUE,
+      'default' => 0,
+    ));
+  }
+}
+
+/**
+ * Update empty sent subscriber count column to current subscriber count.
+ */
+function simplenews_update_7010() {
+  // Assume that already sent newsletters that have a sent subscriber count of
+  // 0 have been sent to all subscribers. Do a update query per newsletter
+  // category, to avoid having to re-execute the subquery on every row.
+  $tids = db_query('SELECT tid FROM {simplenews_category}')->fetchCol();
+  foreach ($tids as $tid) {
+    $count = db_query('SELECT COUNT(*) FROM {simplenews_subscription} ss WHERE status = 1 AND tid = :tid', array(':tid' => $tid))->fetchField();
+    db_update('simplenews_newsletter')
+      ->fields(array(
+        'sent_subscriber_count' => $count,
+      ))
+      // 2 equals SIMPLENEWS_STATUS_SEND_READY.
+      ->condition('status', 2)
+      ->condition('sent_subscriber_count', 0)
+      ->condition('tid', $tid)
+      ->execute();
+  }
 }
\ No newline at end of file
diff --git a/tests/simplenews.test b/tests/simplenews.test
index 92237c9..c5bd3ce 100644
--- a/tests/simplenews.test
+++ b/tests/simplenews.test
@@ -1710,10 +1710,12 @@ class SimpleNewsI18nTestCase extends SimplenewsTestCase {
     // Sign up two users, one in english, another in spanish.
     $english_mail = $this->randomEmail();
     $spanish_mail = $this->randomEmail();
+    $spanish_mail2 = $this->randomEmail();
     $tid = $this->getRandomNewsletter();
 
     simplenews_subscribe_user($english_mail, $tid, FALSE, 'english', 'en');
     simplenews_subscribe_user($spanish_mail, $tid, FALSE, 'spanish', 'es');
+    simplenews_subscribe_user($spanish_mail2, $tid, FALSE, 'spanish', 'es');
 
     // Translate category.
     $vocabulary = taxonomy_vocabulary_machine_name_load('newsletter');
@@ -1776,7 +1778,7 @@ class SimpleNewsI18nTestCase extends SimplenewsTestCase {
     $this->drupalPost(NULL, $edit, t('Submit'));
     simplenews_cron();
 
-    $this->assertEqual(2, count($this->drupalGetMails()));
+    $this->assertEqual(3, count($this->drupalGetMails()));
 
     $category = simplenews_category_load($this->getRandomNewsletter());
 
@@ -1788,7 +1790,7 @@ class SimpleNewsI18nTestCase extends SimplenewsTestCase {
         $this->assertEqual('[' . $category->name . '] ' . $english_node->title, $mail['subject']);
         $node_url = url('node/' . $english_node->nid, array('language' => $languages['en'], 'absolute' => TRUE));
       }
-      elseif ($mail['to'] == $spanish_mail) {
+      elseif ($mail['to'] == $spanish_mail || $mail['to'] == $spanish_mail2) {
         $this->assertEqual('es', $mail['language']);
         $this->assertEqual('[' . $es_name . '] ' . $spanish_node->title, $mail['subject']);
         $node_url = url('node/' . $spanish_node->nid, array('language' => $languages['es'], 'absolute' => TRUE));
@@ -1801,6 +1803,12 @@ class SimpleNewsI18nTestCase extends SimplenewsTestCase {
       $this->assertTrue(strpos($mail['body'], $node_url) !== FALSE);
     }
 
+    // Verify sent subscriber count for each node.
+    $newsletter = simplenews_newsletter_load($english_node->nid);
+    $this->assertEqual(1, $newsletter->sent_subscriber_count, 'subscriber count is correct for english');
+    $newsletter = simplenews_newsletter_load($spanish_node->nid);
+    $this->assertEqual(2, $newsletter->sent_subscriber_count, 'subscriber count is correct for spanish');
+
     // Make sure the language of a node can be changed.
     $english = array(
       'title' => $this->randomName(),
@@ -2134,6 +2142,9 @@ class SimplenewsSendTestCase extends SimplenewsTestCase {
       unset($this->subscribers[$mail['to']]);
     }
     $this->assertEqual(0, count($this->subscribers), t('all subscribers have been received a mail'));
+
+    $newsletter = simplenews_newsletter_load($node->nid);
+    $this->assertEqual(5, $newsletter->sent_subscriber_count, 'subscriber count is correct');
   }
 
   /**
@@ -2241,8 +2252,8 @@ class SimplenewsSendTestCase extends SimplenewsTestCase {
 
     // Verify state.
     $newsletter = simplenews_newsletter_load($node->nid);
-
     $this->assertEqual(SIMPLENEWS_STATUS_SEND_PENDING, $newsletter->status, t('Newsletter sending pending.'));
+    $this->assertEqual(3, $newsletter->sent_subscriber_count, 'subscriber count is correct');
 
     $spooled = db_query('SELECT COUNT(*) FROM {simplenews_mail_spool} WHERE nid = :nid', array(':nid' => $node->nid))->fetchField();
     $this->assertEqual(2, $spooled, t('2 mails remaining in spool.'));
@@ -2267,6 +2278,8 @@ class SimplenewsSendTestCase extends SimplenewsTestCase {
       unset($this->subscribers[$mail['to']]);
     }
     $this->assertEqual(0, count($this->subscribers), t('all subscribers have been received a mail'));
+    $newsletter = simplenews_newsletter_load($node->nid);
+    $this->assertEqual(5, $newsletter->sent_subscriber_count, 'subscriber count is correct');
   }
 
   /**