You can setup your iPhone or iPad to receive mail from one of your Exchange mailboxes as follows:

Go to Settings > Mail, Contacts, Calendars > Add Account > Microsoft Exchange

On the next screen enter the following settings:

Email: The full email address for the Exchange mailbox you want to setup
Username: The full email address for the Exchange mailbox you want to setup
Password: The password for the Exchange mailbox
Description: Your own description for the Exchange mailbox on your iPhone/iPad

Press Next

You may now get a message saying it cannot verify the identity of your domain name, just press Continue.

You will now see a “Server” option appear on the screen. In here, you should enter exchange.outitgoes.com and press Next.

If your iPhone or iPad has now successfully connected, you will be presented with the options to sync the Mail, Contacts and Calendar. Choose which ones you would like to sync and then press Save.

Your Exchange mailbox should now be successfully setup