diff --git a/core/email.class.inc.php b/core/email.class.inc.php
index cca10ee14..7dcd7b0fa 100644
--- a/core/email.class.inc.php
+++ b/core/email.class.inc.php
@@ -144,6 +144,11 @@ class EMail
 			$this->m_aHeaders[$sKey] = $sValue;
 		}
 	}
+
+	public function SetMessageId($sId)
+	{
+		$this->AddToHeader('Message-ID', $sId);
+	}
 	
 	public function SetReferences($sReferences)
 	{