(VB.NET) Send High Priority Email (SMTP, X-Priority header)

Demonstrates how to send high-priorty email (or lower priority email) by setting the X-Priority header field.

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' This example requires the Chilkat API to have been previously unlocked.
' See Global Unlock Sample for sample code.

' The mailman object is used for sending and receiving email.
Dim mailman As New Chilkat.MailMan

' Set the SMTP server (obviously, use your SMTP server, not chilkatsoft.com)
mailman.SmtpHost = "smtp.chilkatsoft.com"

' Set the SMTP login/password (if required)
mailman.SmtpUsername = "myUsername"
mailman.SmtpPassword = "myPassword"

' Create a new email object
Dim email As New Chilkat.Email

email.Subject = "This is a test"
email.Body = "This is a test"
email.From = "Chilkat Support <support@chilkatsoft.com>"
Dim success As Boolean = email.AddTo("Chilkat Admin","admin@chilkatsoft.com")
' To add more recipients, call AddTo, AddCC, or AddBcc once per recipient.

' To send high-priority email, 
' add the X-Priority header field with the value "1" 
' to indicate highest-priority.
' A value of "3" is normal, which is the same as not setting
' the X-Priority header at all, and "5" is the lowest. 
' "2" and "4" are in-betweens.

' Microsoft Outlook might add the following headers when
' sending high-priority email.

' X-Priority: 1 (Highest) 
' X-MSMail-Priority: High 
' Importance: High 

' The X-Priority header alone is enough to make the email high-priority.

email.AddHeaderField("X-Priority","1")

' Call SendEmail to connect to the SMTP server and send.
' The connection (i.e. session) to the SMTP server remains
' open so that subsequent SendEmail calls may use the
' same connection.  
success = mailman.SendEmail(email)
If (success <> True) Then
    Debug.WriteLine(mailman.LastErrorText)
    Exit Sub
End If


success = mailman.CloseSmtpConnection()
If (success <> True) Then
    Debug.WriteLine("Connection to SMTP server not closed cleanly.")
End If


Debug.WriteLine("Mail Sent!")