diff --git a/nodemailer/nodemailer-tests.ts b/nodemailer/nodemailer-tests.ts
index 1d99046c0a..a991096d5b 100644
--- a/nodemailer/nodemailer-tests.ts
+++ b/nodemailer/nodemailer-tests.ts
@@ -11,6 +11,20 @@ var transporter: nodemailer.Transporter = nodemailer.createTransport({
     }
 });
 
+// create reusable transporter object using SMTP transport and set default values for mail options.
+transporter = nodemailer.createTransport({
+    service: 'Gmail',
+    auth: {
+        user: 'gmail.user@gmail.com',
+        pass: 'userpass'
+    }
+}, {
+    from: 'sender@address',
+    headers: {
+        'My-Awesome-Header': '123'
+    }
+});
+
 // setup e-mail data with unicode symbols
 var mailOptions: nodemailer.SendMailOptions = {
     from: 'Fred Foo ✔ <foo@blurdybloop.com>', // sender address
@@ -24,5 +38,3 @@ var mailOptions: nodemailer.SendMailOptions = {
 transporter.sendMail(mailOptions, (error: Error, info: nodemailer.SentMessageInfo): void => {
 	// nothing
 });
-
-
diff --git a/nodemailer/nodemailer.d.ts b/nodemailer/nodemailer.d.ts
index e0d1300b0a..e7d09f54f2 100644
--- a/nodemailer/nodemailer.d.ts
+++ b/nodemailer/nodemailer.d.ts
@@ -51,13 +51,13 @@ declare module "nodemailer" {
 	/**
 	 * Create a direct transporter
 	 */
-	export function createTransport(options?: directTransport.DirectOptions): Transporter;
+	export function createTransport(options?: directTransport.DirectOptions, defaults?: Object): Transporter;
 	/**
 	 * Create an SMTP transporter
 	 */
-	export function createTransport(options?: smtpTransport.SmtpOptions): Transporter;
+	export function createTransport(options?: smtpTransport.SmtpOptions, defaults?: Object): Transporter;
 	/**
 	 * Create a transporter from a given implementation
 	 */
-	export function createTransport(transport: Transport): Transporter;
+	export function createTransport(transport: Transport, defaults?: Object): Transporter;
 }