Edited to Update: Bounceback Issue has been resolved.
We are aware of bounce backs emails that are being sent out when submitting information to firstname.lastname@example.org:
This message was created automatically by the mail system.
A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es) failed:
>>> email@example.com (Undelivered): 554 Transaction failed: firstname.lastname@example.org is not a valid address.
We are currently migrating the SalesForce Cases to ZenDesk Tickets and hope to resolve this quickly. Please disregard this email bounce back.