(VB.NET) SMTP NTLM Authentication

See more SMTP Examples

Demonstrates how to specify NTLM authentication for sending email via SMTP.

Chilkat .NET Downloads Chilkat .NET Framework Chilkat for .NET Core

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

Dim mailman As New Chilkat.MailMan

' Specify your particular mail server's SMTP settings.
mailman.SmtpHost = "smtp.my_mail_server.com"
mailman.SmtpPort = 587
mailman.StartTLS = True

' This assumes you know your SMTP server supports NTLM authentication.
' To explicitly request NTLM authentication, set the SmtpAuthMethod property = "ntlm".
mailman.SmtpAuthMethod = "ntlm"

' Note: Normally you should avoid setting the SmtpAuthMethod.
' SMTP servers tell the connecting client the authentication methods it will accept when the initial connection is made.
' Chilkat will automatically use this information to select and use the most secure auth method supported by the server.

Dim useCurrentWindowsUser As Boolean = True

If (useCurrentWindowsUser = True) Then
    ' If you are running on Windows, and you wish for the NTLM credentials of the current logged-on Windows user to be used,
    ' set the username and password to the string "default"
    mailman.SmtpUsername = "default"
    mailman.SmtpPassword = "default"
Else
    ' Explicitly specify the SMTP username/password
    ' The SMTP username is your email account username, which is often your email address.
    mailman.SmtpUsername = "your_smtp_username_or_email_address"
    mailman.SmtpPassword = "your_password"
End If



Dim email As New Chilkat.Email

email.Subject = "This is a test"
email.Body = "This is a test"
' Don't forget to change this to use your email addresses..
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.

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!")