Select Mail in the menu. Click Preferences.
Click the Accounts icon, in the opened window.
Click the + icon in the bottom-left corner of the window.
Choose POP in the drop-down menu Account Type.
The Account Description is only to identify this e-mail account - you can enter anything here.
Full Name will be the name appearing, when people receive e-mails sent through Mail.
Email Address is your e-mail address created in your control panel. In this example mail@yourdomain.com.
Click Continue.
Your incoming mail server is pop.yourdomain.com, where yourdomain.com is your own domain name.
The user name is your e-mail address, mail@yourdomain.com. The password is the one you chose, when you created your account in your control panel.
Ensure that the Use Secure Sockets Layer (SSL) is unchecked and the Authentication is set to Password.
Click Continue.
You can use customer-smtp.one.com as Outgoing Mail Server.
Use Authentication needs to be checked. Provide the same User Name and Password as you entered above.
Click Continue.
You will not need to do any changes here, just click Done.
Once again, select Accounts, as described on page 2 and select Server Settings.
Set the Server port for your Outgoing Mail Server to 2525. Do not edit anything else.
Click OK, and your setup is done. You are now ready to receive your e-mails for your domain.