diff --git a/lib/Cake/Network/Email/SmtpTransport.php b/lib/Cake/Network/Email/SmtpTransport.php
index c581c9a2f52..d7c2336d601 100644
--- a/lib/Cake/Network/Email/SmtpTransport.php
+++ b/lib/Cake/Network/Email/SmtpTransport.php
@@ -98,6 +98,8 @@ public function send(CakeEmail $email) {
 		$this->_sendData();
 		$this->_disconnect();
 
+		$this->_cakeEmail = null;
+
 		return $this->_content;
 	}