diff -uprN a/privatemsg/privatemsg.module b/privatemsg/privatemsg.module
--- a/privatemsg/privatemsg.module	2010-03-12 17:09:00.000000000 +0100
+++ b/privatemsg/privatemsg.module	2010-03-25 01:24:49.828125000 +0100
@@ -1793,10 +1793,10 @@ function _privatemsg_validate_message(&$
 
   if (empty($message['recipients']) || !is_array($message['recipients'])) {
     if ($form) {
-      form_set_error('to', t('Disallowed to send a message without atleast one valid recipient'));
+      form_set_error('to', t('Disallowed to send a message without at least one valid recipient'));
     }
     else {
-      $messages['error'][] = t('Disallowed to send a message without atleast one valid recipient');
+      $messages['error'][] = t('Disallowed to send a message without at least one valid recipient');
     }
   }
 
diff -uprN a/privatemsg/tests/privatemsgapi.test b/privatemsg/tests/privatemsgapi.test
--- a/privatemsg/tests/privatemsgapi.test	2010-02-20 09:51:38.000000000 +0100
+++ b/privatemsg/tests/privatemsgapi.test	2010-03-25 10:56:25.750000000 +0100
@@ -54,7 +54,7 @@ class PrivatemsgAPITestCase extends Drup
     $this->assertEqual('Disallowed to send a message without subject', $resultf1['messages']['error'][0], 'API denied to send message without subject');
 
     $resultf2 = privatemsg_new_thread(array(), 'no recipients', 'Body text', array('author' => $author));
-    $this->assertEqual('Disallowed to send a message without atleast one valid recipient', $resultf2['messages']['error'][0], 'API denied to send message without recipients');
+    $this->assertEqual('Disallowed to send a message without at least one valid recipient', $resultf2['messages']['error'][0], 'API denied to send message without recipients');
     $message = $this->getMessageFromSubject('no recipients');
     $this->assertTrue(empty($message), 'Message was not saved in database');