Class of Service

Yakov Shafranovich wrote:
> 
> I would add to that message tracking, return and delivery receipts. It
> would be useful for some higher value email to be tracked. Maybe also
> higher classes of service.
> 
> Perhaps this is where the economic model can come in - people might be
> willing to pay more for value added services.

In general business and industry expect more from an email service than e.g. 
a home user communicating with family members.  Classes of service may well be 
a means of providing users with a service that more closely matches their 
requirements.  Perhaps two grades of service e.g. High Grade and Regular Grade.  
E.G. A High Grade service may provide: - sophisticated confidentiality, 
integrity and authentication functionality - proof that mail has been delivered and 
read - high reliability etc
Regular Grade would be characterized by its simplicity and low cost.

John B