Visual Basic 6.0
Visual Basic 6.0
Get the SMTP or POP3 Server's TLS Certificate
See more SMTP Examples
Demonstrates the Chilkat MailMan.GetServerCert method, which gets the digital certificate presented by the SMTP or POP3 server for the current SSL/TLS connection and stores it in a Cert object. Pass true for the SMTP server's certificate or false for the POP3 server's. This example connects to the SMTP server and prints the certificate's subject and issuer.
Background: During a TLS handshake the server presents a certificate proving its identity, and the client validates it against trusted authorities. Retrieving that certificate lets you inspect it yourself — checking the subject, issuer, or expiration for auditing, logging, or certificate-pinning style checks. It must be called while a TLS connection is established, since the certificate belongs to that specific session.
Chilkat Visual Basic 6.0 Downloads
Dim success As Long
success = 0
' Demonstrates the MailMan.GetServerCert method, which gets the digital certificate
' presented by the SMTP or POP3 server for the current SSL/TLS connection. Pass 1 for
' the SMTP server's certificate, or 0 for the POP3 server's certificate.
Dim mailman As New ChilkatMailMan
' Configure the SMTP server connection.
mailman.SmtpHost = "smtp.example.com"
mailman.SmtpPort = 465
mailman.SmtpSsl = 1
mailman.SmtpUsername = "user@example.com"
mailman.SmtpPassword = "myPassword"
' Establish the TLS connection.
success = mailman.SmtpConnect()
If (success = 0) Then
Debug.Print mailman.LastErrorText
Exit Sub
End If
' Get the certificate the SMTP server presented (useSmtp = 1).
Dim cert As New ChilkatCert
success = mailman.GetServerCert(1,cert)
If (success = 0) Then
Debug.Print mailman.LastErrorText
Exit Sub
End If
Debug.Print "Server certificate subject (CN): " & cert.SubjectCN
Debug.Print "Issued by: " & cert.IssuerCN
success = mailman.CloseSmtpConnection()
If (success = 0) Then
Debug.Print mailman.LastErrorText
Exit Sub
End If