So how do I change the domain to the corporate domain to avoid spam and account restrictions?

Do I just change the email? to my corporate email ? 

If you are trying to change the recipient address of email to a different address, here is how to do so:

https://www.jotform.com/help/314-How-to-Properly-Add-Change-and-Test-a-New-Email-Recipient-Address

If you are trying to change the sender address to your own address, here is how that is done:

https://www.jotform.com/help/244-How-to-Setup-SMTP-for-a-Form