In our hosted environment, we utilize a robust email system that will deliver email to any recipient.  However, while the email is being delivered with a "Send From" address with your own district email domain, the message is physically coming from us.  This requires the district to create a SPF record (or append an existing record) which will contain the IP address of our mail server for your specific hosted location.  You can have your network professional call us to request the IP address.