Setting up Microsoft Outlook

Open Outlook and select Tools. Click E-mail Accounts.

Select Add a new e-mail account"

Click Next

Select IMAP and click Next

Enter Your name and E-mail address

For Incoming mail server (IMAP), enter imap.yourdomain.com, yourdomain.com being your domain hosted by One.com.
For outgoing (SMTP) server, enter send.one.com

In Logon Information enter the e-mail address and password that you created in the control panel
(Check Create a new e-mail account)

Configuration of the SMTP server in Outlook

Click More settings

Select Outgoing Server and then My outgoing server (SMTP) requires authentication. Click OK.

Click Next

Click Finish

Select Advanced. In Outgoing server (SMTP) enter 2525.

Click OK