Please double, triple and quadruple check your settings when you're setting up your email. 99.9% of issues are typically misspellings or incorrect settings.
Log into your webmail
Navigate to your Webmail Home.
Find the Configure Mail Client area, and click into it.
Copy down the settings, or add them to your Mail App. You may also download the preconfigured setup files for the listed applications.
For more information and troubleshooting, please visit our Email Setup instructions page, and enter your email in the Get Setup Instructions for field.