InternetHeaders.AppendHeader
From Real Software Documentation
Method
Appends a new header.
Example
dim mail as emailMessage
.
.
// populate the email message
mail = new emailMessage
mail.fromAddress = fromAddressFld.text
mail.subject = subjectFld.text
mail.bodyPlainText = bodyFld.text
mail.bodyHTML = htmlFld.text
mail.headers.appendHeader "X-Mailer","REAL Studio SMTP Demo"