Follow the instructions below, using your email address as username and email address, your password as you set it on the server, and 'yourdomainname.com' where it says example.com
To set up Microsoft Office Outlook 2010:
1.Open Microsoft Office Outlook.
2.Go to File > Info > Add Account.
3.Select the checkbox Manually configure server settings or additional server types. Click Next.
4.Select the Internet E-mail option and click Next.
5.Specify the following:
◦Your e-mail address.
◦Account type. If you want to keep copies of messages on the server, select the IMAP option. If you do not want to keep any messages on the server, select the POP3 option.
◦Incoming mail server. Type mail.yourdomainname.com For example, mail.example.com.
◦Outgoing mail server (SMTP). Type mail.yourdomainname.com For example, mail.example.com.
◦User Name. Specify your full e-mail address. Example: firstname.lastname@example.org.
◦Password. This is as you set it when adding your account to the server.
◦Require logon using Secure Password Authentication (SPA). Leave this option cleared.
6.Click More Settings, open the Outgoing Server tab and check My outgoing server (SMTP) requires authentication.
7. Click OK.
Note: Your server with Nimbus is capable of being used as a basic mail server, but the ongoing battle between spam management, hacking and blacklisting means that Office 365 and Google Apps are the go-to platforms if email is critical to your business/site. Read more here.