This is a small node js server that can send emails using nodemailer.
git clone https://github.com/fossasia/mailer.git
cd mailer
Install dependancies.
npm install
Visit localhost:3100 on your browser.
You can actually make it send emails using your gmail account. However it might involve you clearing some security for your account. Proceed at your own risk.
copy the config files:
cp config.json.dist config.json
Edit config.json with your gmail username and password. Fire up the mail server again. Send emails!