One of the most common issues for not being able to login to retrieve email is your settings.

Be sure you have the following settings in your email client or our webmail screen to access email:

Username: account%domain.com

Incoming (POP3) Server: pop3.domain.com

Outgoing (SMTP) Server: smtp.domain.com

Below are screen shots of how to setup Outlook:

First, Open Outlook and click on Tools from the toolbar at the top.  Select E-Mail Accounts from the drop down list.

.

Select Add a new e-mail account and click on Next.

Select the radio button for POP3 server, and click Next.

Fill in the requested information, substituting 'myname' for your email account name and 'domain.com' with your domain name, then click on More Settings.  Click on the Outgoing Server Tab.

Check the checkbox for "My server outgoing (SMTP) server requires authentication".  When you check the box, Outlook will automatically default to use the same login information as your incoming server.  Leave the default settings and click on Ok.

You may now test your email settings.

If you receive errors that Outlook failed to connect to your Outgoing (SMTP) server, you may need to use your Internet Service Providers (ISP) outgoing server settings to send mail.  Many cable internet providers and other large Internet Service Providers (ISP) block the use of third party mail servers.  For more information on these settings, please contact your Internet Service Provider (ISP).