Index: Classes/ExtDirect/ActionHandler.php
===================================================================
--- Classes/ExtDirect/ActionHandler.php	(revision 3359)
+++ Classes/ExtDirect/ActionHandler.php	(working copy)
@@ -246,10 +246,16 @@
 			$additionalRecipients = array();
 		}
 
-		$finalRecipients = array_unique(
+		$allRecipients = array_unique(
 			array_merge($recipients, $additionalRecipients)
 		);
 
+		foreach ($allRecipients as $recipient) {
+			if (t3lib_div::validEmail($recipient)) {
+				$finalRecipients[] = $recipient;
+			}
+		}
+
 		return $finalRecipients;
 	}
 
@@ -443,7 +449,7 @@
 
 	/**
 	 * Gets all assigned recipients of a particular stage.
-	 * 
+	 *
 	 * @param integer $stage
 	 * @return array
 	 */
@@ -452,12 +458,15 @@
 
 		$recipients = $this->getStageService()->getResponsibleBeUser($stage);
 
-		foreach ($recipients as $id => $name) {
-			$result[] = array(
-				'boxLabel' => $name,
-				'name' => 'receipients-' . $id,
-				'checked' => TRUE,
-			);
+		foreach ($recipients as $id => $user) {
+			if (t3lib_div::validEmail($user['email'])) {
+				$name = $user['realName'] ? $user['realName'] : $user['username'];
+				$result[] = array(
+					'boxLabel' => sprintf('%s (%s)', $name, $user['email']),
+					'name' => 'receipients-' . $id,
+					'checked' => TRUE,
+				);
+			}
 		}
 
 		return $result;
Index: Classes/Service/Stages.php
===================================================================
--- Classes/Service/Stages.php	(revision 3359)
+++ Classes/Service/Stages.php	(working copy)
@@ -416,7 +416,7 @@
 
 		if (!empty($userRecords) && is_array($userRecords)) {
 			foreach ($userRecords as $userUid => $userRecord) {
-				$recipientArray[$userUid] = $userRecord['email'] . ' ( ' . $userRecord['realName'] . ' )';
+				$recipientArray[$userUid] = $userRecord;
 			}
 		}
 		return $recipientArray;