Let's have a destructor clean up SMTP rather than doing it manually

class.phpmailer.php

@@ -545,6 +545,15 @@ class PHPMailer {
     $this->exceptions = ($exceptions == true);
   }
 
+  /**
+   * Destructor
+   */
+  public function __destruct() {
+      if ($this->Mailer == 'smtp') { //Close any open SMTP connection nicely
+          $this->SmtpClose();
+      }
+  }
+
   /**
    * Sets message type to HTML.
    * @param bool $ishtml