When you create a company on AutoEntry you will be given two email addresses, one sales and one purchases eg: ExamCo-purchases@ mail.AutoEntry.com. To find this just go to your company settings. You can easily edit this email by just clicking in the entry box and adjusting the name in any way you wish.
The only restriction is that the address is not already in use by another user on AutoEntry. If so, when you try to save the changes they will not save. Simply edit the address again to make it unique.