To configure Windows Mail:

1. Open Windows Mail.
2. Click the Tools menu, and select Accounts...
3. Click Add...
4. Select Email Account, and click Next.
5. Enter your name as you would like it to appear in the 'From:' field of outgoing messages, and click Next.
6. Enter your full email address (username@your_domain.com).
7. Fill in all necessary fields to include the following information:

Incoming mail server type: POP3

Incoming mail (POP3 or IMAP) server: mail.themarcomgroup.com.

Outgoing e-mail server (SMTP) name: mail.themarcomgroup.com

Outgoing server requires authentication: enabled

8. Click Next, and enter your full email address (including '@your_domain.com') and your email password.
9. Click Next, and then check the box next to Do not download my e-mail at this time. Click Finish.
10. On the Internet Accounts screen, make sure that your mail.themarcomgroup.com mail account is selected, and click the Properties button.
11. On the Advanced tab, enter 587 in the in the box next to Outgoing mail (SMTP).
12. Click OK. You're done! Close the Internet Accounts window and click Send/Receive to start checking your email messages.