If you’re using MDaemon as your email server, you can configure turboSMTP as your smart host relay service. It will improve your security and your deliverability. Here’s how to do it:
- Start MDaemon
 - Follow the path: Setup > Server Settings > Delivery

 - Under Message Routing, mark Send all outbound email to a smart host
 - In the Default Smart host field enter pro.turbo-smtp.com
 - Mark Use SMTP authentication and fill in the username and password with your turboSMTP API Keys (enter your Consumer Key and Consumer Secret instead of username and password — see how to create your API Keys)
 - Click Apply then OK 

 - From the Server settings menu, open Port and enter the code: 25. turbo SMTP also supports ports number 587 and 465
 - Click Apply , then OK
