I am with Xtra and having difficulty sending

Hosting Alternate SMTP Port Tutorial

This tutorial is designed to help you send with your Enlighten Hosting Email account if you need to change your Outgoing mail Server port. This is particularly useful for Xtra customers.

1. - Click the File menu and select Preferences.

2. – Go the Accounts tab. Select your mail.enlightenhosting.com account and then click the Outgoing Mail Server (SMTP) dropdown and select Edit SMTP Server List…

3. Ensure the Enlighten Server is selected then go to the Advanced tab. Choose Use custom port and type 366.

4. - Select OK and exit from the Preferences menu choosing to save changes