Adding custom Mail header to System.Net.Mail.MailMessage

I am creating MailMessage out of already existing email message.
My existing message has few custom properties. I wan to add them to
System.Net.Mail.MailMessage

How to add custom properties?

I was thinking adding custom properties to
System.Net.Mail.MailMessage.Headers. but it's a READONLY property.
System.Net.Mail.MailMessage has few header fields as properties (eg:
FROM, TO, CC) and these are not sufficient.

So, if I have to use System.Net.Mail.MailMessage, do I have to ignore
the custom header properties?

Thanks
Ramesh

.

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