How can one get a Comcast tech to speak to a tech at another organization to resolve problems

We use an automated registration system managed owned and created by a company that specializes in education registration.  When we trigger emails through the automated system, they often don't arrive to our clients who have comcast.net emails but do arrive to clients with other email companies.  There are periods when we receive bounce-backs from a server that does not belong to Comcast and there are periods where we just hear from the comcast.net users that they do not receive the messages generated through the registration system.  This affects user names, password, class reminders, confirmations, invoices, etc.

The company that owns and manages the system has asked me if a comcast tech person can communicate with them so they can determine what settings may be causing this issue.