VB.NET

Verify SMTP Login (Connect and Authenticate)

Demonstrates the Chilkat MailMan.VerifySmtpLogin method, which tests whether Chilkat can connect to the configured SMTP server and successfully authenticate using the current SMTP authentication settings. This example configures the SMTP host and credentials and verifies login.

Background: This goes one step further than VerifySmtpConnection: after reaching the server it also performs the AUTH exchange with your username and password (or OAuth2 token). It's the ideal preflight check when validating credentials or diagnosing "why won't my mail send?" — a false result after a good connection points squarely at bad credentials or an unsupported auth method rather than a network problem.

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VB.NET

Dim success As Boolean = False

'  Demonstrates the MailMan.VerifySmtpLogin method, which tests whether Chilkat can connect
'  to the configured SMTP server and successfully authenticate using the current SMTP
'  authentication settings.

Dim mailman As New Chilkat.MailMan

'  Configure the SMTP server connection.
mailman.SmtpHost = "smtp.example.com"
mailman.SmtpPort = 465
mailman.SmtpSsl = True
mailman.SmtpUsername = "user@example.com"
mailman.SmtpPassword = "myPassword"

'  Test both connectivity and authentication.
Dim loggedIn As Boolean = mailman.VerifySmtpLogin()

If (loggedIn = True) Then
    Debug.WriteLine("Successfully connected and authenticated with the SMTP server.")
Else
    Debug.WriteLine("SMTP connect or login failed.")
End If