set azure information protection label for EWS

@Gu, Wenlong A,

To set an Azure Information Protection label for sending email through EWS code, you can use the following steps:

1. Create a new email message using the Microsoft.Exchange.WebServices.Data.EmailMessage class.
2. Set the Microsoft.Exchange.WebServices.Data.EmailMessage.Sensitivity property to Microsoft.Exchange.WebServices.Data.Sensitivity.Normal.
3. Set the Microsoft.Exchange.WebServices.Data.EmailMessage.Headers property to include the MSIP_Label_<GUID>_Enabled header, where <GUID> is the GUID of the label you want to apply.
4. Send the email message using the Microsoft.Exchange.WebServices.Data.EmailMessage.SendAndSaveCopy() method.

Here is an example code snippet that demonstrates how to set an Azure Information Protection label for sending email through EWS code in C#:

EmailMessage message = new EmailMessage(service);
message.Subject = "Test Email";
message.Body = new MessageBody("This is a test email.");
message.ToRecipients.Add("recipient@example.com");
message.Sensitivity = Sensitivity.Normal;
message.Headers.Add("MSIP_Label_12345678-1234-5678-1234-567812345678_Enabled", "true");
message.SendAndSaveCopy();

Please note that you will need to replace 12345678-1234-5678-1234-567812345678 with the GUID of the label you want to apply.

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