Expire Email sent to exchange server after 24 hours

[Imran Aziz]

Hello All,
I am using System.Net.Mail (.net 2)
class to send out emails. What I want to do is set the property in the email
sent to expire after 24 hours. This can be done in Outlook by using the
options tab in the new message window. How can this be done using these
classes or any other method programmatically ?
What I want is the email to expire after 24 hours.

Imran.