Setting Email Header Message Id property in C#

Hi

I am working with the following simple mail message, seen in the code below.

How do I set the Message Id proprty contained in the header information for an outgoing mail??

I would like to do something like:
msgClient.Headers.MessageId = messageId;

I see that the MailMessage class has the following property:
public NameValueCollection Headers

I suspect I would need to use that, but how??

Thanks

MailMessage msgClient = new MailMessage();
msgClient.From = "test@test.com"

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