How do I email Active Directory distribution groups from a c# web application?

I'm trying to send email to Active Directory distribution groups.

I know you can send mail using something like:

 mail.From = new MailAddress("");

 //set the content
 mail.Subject = "This is an email";
 mail.Body = "this is a sample body with html in it.";
 mail.IsBodyHtml = true;

 //send the message
 SmtpClient smtp = new SmtpClient("");
 // i seem to need this too....
 smtp.DeliveryMethod = SmtpDeliveryMethod.PickupDirectoryFromIis;

But when I try to stick in a (valid) AD group (eg "My Test Group") in the To field, it kicks it out because it is not a valid email address.

I'm sure this is really straightforward, but I seem to be stuck...



You distribution group has a mail address, that's what you need to add in the 'to' parameter.

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