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* In order to reduce SPAM, all email addresses will be obfuscated so they cannot be read by spam bots.
For example: 'test@test.com' will become 'test (at) test dot com'.

How do I add custom headers to the MailMessage?
To add custom headers to an email, you need to use the MailMessage.Headers property. For example:

mail.Headers.Add( "X-Organization", "My Company LLC")
The following code snippet demonstrates this technique.
 
[ C# ] 
MailMessage mail = new MailMessage();
mail.To = "me@mycompany.com";
mail.From = "you@yourcompany.com";
mail.Subject = "this is a test email.";
mail.Body = "this is my test email body.";
mail.Headers.Add( "X-Organization", "My Company LLC" );
SmtpMail.SmtpServer = "localhost";  //your real server goes here
SmtpMail.Send( mail );

[ VB.NET ] 
Dim mail As New MailMessage()
mail.To = "me@mycompany.com"
mail.From = "you@yourcompany.com"
mail.Subject = "this is a test email."
mail.Body = "this is my test email body."
mail.Headers.Add("X-Organization", "My Company LLC")
SmtpMail.SmtpServer = "localhost" 'your real server goes here
SmtpMail.Send(mail)