diff --git a/app/code/local/Aschroder/SMTPPro/Model/Email.php b/app/code/local/Aschroder/SMTPPro/Model/Email.php
index 575f755..a559061 100644
--- a/app/code/local/Aschroder/SMTPPro/Model/Email.php
+++ b/app/code/local/Aschroder/SMTPPro/Model/Email.php
@@ -35,6 +35,7 @@ public function send() {
 
         $mail->setFrom($this->getFromEmail(), $this->getFromName())
             ->addTo($this->getToEmail(), $this->getToName())
+            ->clearSubject()
             ->setSubject($this->getSubject());
 
         $transport = new Varien_Object(); // for observers to set if required
diff --git a/app/code/local/Aschroder/SMTPPro/Model/Email/Template.php b/app/code/local/Aschroder/SMTPPro/Model/Email/Template.php
index 1a945f8..3db14ed 100644
--- a/app/code/local/Aschroder/SMTPPro/Model/Email/Template.php
+++ b/app/code/local/Aschroder/SMTPPro/Model/Email/Template.php
@@ -89,6 +89,7 @@ public function send($email, $name = null, array $variables = array())
             $mail->setBodyHTML($text);
         }
 
+        $mail->clearSubject();
         $mail->setSubject('=?utf-8?B?' . base64_encode($this->getProcessedTemplateSubject($variables)) . '?=');
         $mail->setFrom($this->getSenderEmail(), $this->getSenderName());