diff --git a/privatemsg.module b/privatemsg.module
index 2ac06e3..f2f2071 100755
--- a/privatemsg.module
+++ b/privatemsg.module
@@ -1462,6 +1462,13 @@ function privatemsg_privatemsg_block_message($author, $recipients, $context = ar
         'message' => t('%recipient has disabled private message receiving.', array('%recipient' => privatemsg_recipient_format($recipient, array('plain' => TRUE)))),
       );
     }
+    // Do not send private messages to blocked users.
+    else if (isset($recipient->status) && (!$recipient->status)) {
+      $blocked[] = array(
+        'recipient' => 'user_' . $recipient->uid,
+        'message' => t('%recipient has disabled his or her account.', array('%recipient' => privatemsg_recipient_format($recipient, array('plain' => TRUE)))),
+      );
+    }
   }
 
   return $blocked;
diff --git a/privatemsg.test b/privatemsg.test
index ed22447..5483c6a 100644
--- a/privatemsg.test
+++ b/privatemsg.test
@@ -238,10 +238,14 @@ class PrivatemsgTestCase extends PrivatemsgBaseTestCase {
    * Test sending message from the /messages/new page between two people
    */
   function testWriteReplyPrivatemsg() {
-    // Create a author and two recipients.
-    $author     = $this->drupalCreateUser(array('write privatemsg', 'select text format for privatemsg', filter_permission_name(filter_format_load('full_html'))));
+    // Create an author and two recipients.
+    $author     = $this->drupalCreateUser(array('read privatemsg', 'write privatemsg', 'select text format for privatemsg', filter_permission_name(filter_format_load('full_html'))));
     $recipient  = $this->drupalCreateUser(array('read privatemsg'));
     $recipient2  = $this->drupalCreateUser(array('read privatemsg', 'write privatemsg'));
+    // Set up a user with "read/write privatemsg" permissions.
+    $blocked_recipient = $this->drupalCreateUser(array('read privatemsg', 'write privatemsg')); 
+    // Block this recipient to test users who cancelled their accounts.
+    user_save($blocked_recipient, array('status' => 0));
 
     // Login author and go to new message form.
     $this->drupalLogin($author);
@@ -265,12 +269,24 @@ class PrivatemsgTestCase extends PrivatemsgBaseTestCase {
       'subject'     => $this->randomName(20),
       'body[value]' => $this->randomName(100),
     );
-    // Invalid recipient
+    // Invalid recipient.
     $editinvalid = array(
       'recipient'   => $this->randomName(5),
       'subject'     => $this->randomName(20),
       'body[value]' => $this->randomName(100),
     );
+    // Blocked recipient.
+    $editrecipientblocked = array(
+      'recipient'   => $blocked_recipient->name,
+      'subject'     => $this->randomName(20),
+      'body[value]' => $this->randomName(100),
+    );
+    // Message for which the author will be blocked later.
+    $editauthorblocked = array(
+      'recipient'   => $recipient2->name,
+      'subject'     => $this->randomName(20),
+      'body[value]' => $this->randomName(100),
+    );
     // Empty body.
     $editnobody = array(
       'recipient'   => $recipient->name,
@@ -324,6 +340,14 @@ class PrivatemsgTestCase extends PrivatemsgBaseTestCase {
     $this->assertText(t('You must include at least one valid recipient.'), 'Message was not sent.');
     $this->assertText(t('The following recipients will not receive this private message: @recipients.', array('@recipients' => $editinvalid['recipient'])), 'Message about non-existing user displayed.');
 
+    $this->drupalPost('messages/new', $editrecipientblocked, t('Send message'));
+    $this->assertText(t('@recipients has disabled his or her account.', array('@recipients' => $blocked_recipient->name)), 'Message about blocked user displayed.');
+    $this->assertText(t('You are not allowed to send this message because all recipients are blocked.'), 'Message was not sent.');
+
+    // We will block the author later to test whether the reply form appears.
+    $this->drupalPost('messages/new', $editauthorblocked, t('Send message'));
+    $this->assertText(t('A message has been sent to @recipients.', array('@recipients' => $recipient2->name)), 'Message sent confirmation displayed.');
+
     $this->drupalPost('messages/new', $editnobody, t('Send message'));
     $this->assertText(t('A message has been sent to @recipients.', array('@recipients' => $recipient->name)), 'Message sent confirmation displayed.');
 
@@ -416,8 +440,17 @@ class PrivatemsgTestCase extends PrivatemsgBaseTestCase {
     $this->assertText($edit2['body[value]'], 'Found message body.');
     // Confirm that we can read the reply that was sent.
     $this->assertText($reply['body[value]'], 'Found reply body.');
-  }
 
+    // Block the author.
+    user_save($author, array('status' => 0));
+    $this->drupalLogin($recipient2);
+    // Navigate into the message.
+    $this->drupalGet('messages');
+    $this->clickLink($editauthorblocked['subject']);
+    // Confirm that the reply form is not shown.
+    $this->assertNoText(t('Reply'), 'Reply form is not displayed.');
+    $this->assertText(t('You can not reply to this conversation because all recipients are blocked.'));
+  }
   /**
    * Test functionality around disabling private messaging.
    */