diff --git a/classes/Notice.php b/classes/Notice.php
index c5c07e6d19..22796abcfa 100644
--- a/classes/Notice.php
+++ b/classes/Notice.php
@@ -1732,7 +1732,6 @@ class Notice extends Managed_DataObject
     function sendReplyNotifications()
     {
         // Don't send reply notifications for repeats
-
         if ($this->isRepeat()) {
             return array();
         }
@@ -1742,9 +1741,11 @@ class Notice extends Managed_DataObject
             require_once INSTALLDIR.'/lib/mail.php';
 
             foreach ($recipientIds as $recipientId) {
-                $user = User::getKV('id', $recipientId);
-                if ($user instanceof User) {
+                try {
+                    $user = User::getByID($recipientId);
                     mail_notify_attn($user, $this);
+                } catch (NoResultException $e) {
+                    // No such user
                 }
             }
             Event::handle('EndNotifyMentioned', array($this, $recipientIds));
diff --git a/lib/activityhandlerplugin.php b/lib/activityhandlerplugin.php
index 967454bad5..d22b4d2f44 100644
--- a/lib/activityhandlerplugin.php
+++ b/lib/activityhandlerplugin.php
@@ -233,6 +233,9 @@ abstract class ActivityHandlerPlugin extends Plugin
     protected function notifyMentioned(Notice $stored, array &$mentioned_ids)
     {
         // pass through silently by default
+
+        // If we want to stop any other plugin from notifying based on this activity, return false instead.
+        return true;
     }
 
     /**
@@ -305,10 +308,7 @@ abstract class ActivityHandlerPlugin extends Plugin
             return true;
         }
 
-        $this->notifyMentioned($stored, $mentioned_ids);
-
-        // If it was _our_ notice, only we should do anything with the mentions.
-        return false;
+        return $this->notifyMentioned($stored, $mentioned_ids);
     }
 
     /**
diff --git a/lib/mail.php b/lib/mail.php
index a5e9efded1..2076476f87 100644
--- a/lib/mail.php
+++ b/lib/mail.php
@@ -30,9 +30,7 @@
  * @link      http://status.net/
  */
 
-if (!defined('STATUSNET') && !defined('LACONICA')) {
-    exit(1);
-}
+if (!defined('GNUSOCIAL')) { exit(1); }
 
 require_once 'Mail.php';