How do I serialize a mail message?

I get the following when tying to serialize a mial message using the los foratter.

Error: Sys.WebForms.PageRequestManagerServerErrorException: Error serializing value 'System.Net.Mail.MailMessage' of type 'System.Net.Mail.MailMessage.'

Is there an EASY way to serialize this object or am I going have to searialize each o fhte properties individually?