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(VB.NET) Send DKIM Signed EmailDemonstrates how to create a simple email, add a DKIM signature, and send it.
' 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 ' The dkim object is used for creating the DKIM signature. Dim dkim As New Chilkat.Dkim ' Set the SMTP server. mailman.SmtpHost = "smtp.chilkatsoft.com" ' Set the SMTP login/password (if required) mailman.SmtpUsername = "myUsername" mailman.SmtpPassword = "myPassword" ' Set the SmtpPort if your SMTP server uses an alternative port (default = 25) mailman.SmtpPort = 587 ' 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>" ' We'll send the email to a Yahoo email account. It is then ' possible to view the full headers within the Yahoo email ' interface to see if the DKIM signature was accepted. Dim success As Boolean = email.AddTo("Chilkat Software","chilkat_software@yahoo.com") success = email.AddTo("Chilkat Admin","admin@chilkatsoft.com") ' When sending an email with a DKIM signature, the MIME ' of the email must not be modified (in significant ways) prior to ' or during the sending process. Therefore, the MIME of the ' email is assembled, the DKIM signature is added, and then ' SendMimeBytes is called to send the email. ' Get the MIME of the email. Calling RenderToMimeBytes ' causes the email to be signed and/or encrypted if those options ' have been selected. The MIME returned by RenderToMimeBytes ' is the exact MIME that would've been sent if SendEmail was ' called. We'll add a DKIM signature header to this MIME and then send... Dim mimeData() As Byte mimeData = mailman.RenderToMimeBytes(email) If (mailman.LastMethodSuccess <> True) Then Debug.WriteLine(mailman.LastErrorText) Exit Sub End If ' To create a DKIM signature for email (i.e. MIME), ' you'll need to provide the following: ' (1) An RSA private key in any common file format. ' (2) The domain name (typically the same domain ' as the sender of an email). ' (3) A selector for the domain name -- an arbitrary string ' to identify the matching public key in DNS. ' To allow an email recipient to verify the DKIM signature via an ' external email client supporting DKIM or using other software, ' you will need to create a DNS record with the selector ' and matching public key. This example does not provide ' information about DKIM DNS record creation. ' (Chilkat does not provide an API for creating DNS records. ' Creating the DKIM DNS record is something you would do ' manually.) ' Set the domain and selector: ' You'll need to provide your own values here.. dkim.DkimDomain = "chilkatsoft.com" dkim.DkimSelector = "brisbane" ' Load a private key from any common RSA private key ' format, such as DER, PKCS8, PEM, XML, etc. ' The LoadDkimPkFile method automatically detects ' the file format and reads it appropriately. ' If a password is not required, you'll still need to provide ' a password string argument, but it is ignored. Dim password As String = "optionalPassword" Dim privKey As New Chilkat.PrivateKey success = privKey.LoadAnyFormatFile("myPrivateKey.pem",password) If (success <> True) Then Debug.WriteLine(privKey.LastErrorText) Exit Sub End If success = dkim.SetDkimPrivateKey(privKey) If (success <> True) Then Debug.WriteLine(dkim.LastErrorText) Exit Sub End If ' Add the DKIM-Signature header and ' returns the new MIME with DKIM-Signature added. Dim dkimSignedMime() As Byte dkimSignedMime = dkim.AddDkimSignature(mimeData) If (dkim.LastMethodSuccess <> True) Then Debug.WriteLine(dkim.LastErrorText) Exit Sub End If ' Call SendMimeBytes to connect to the SMTP server and send. ' The connection (i.e. session) to the SMTP server remains ' open so that subsequent Send* calls may use the ' same connection. Dim strFrom As String = "support@chilkatsoft.com" ' To send to multiple email addresses, the strTo should be set to a comma-separated ' list of email addresses. Dim strTo As String = "chilkat_software@yahoo.com, admin@chilkatsoft.com" success = mailman.SendMimeBytes(strFrom,strTo,dkimSignedMime) If (success <> True) Then Debug.WriteLine(mailman.LastErrorText) Exit Sub End If ' Some SMTP servers do not actually send the email until ' the connection is closed. In these cases, it is necessary to ' call CloseSmtpConnection for the mail to be sent. ' Most SMTP servers send the email immediately, and it is ' not required to close the connection. We'll close it here ' for the example: success = mailman.CloseSmtpConnection() If (success <> True) Then Debug.WriteLine("Connection to SMTP server not closed cleanly.") End If Debug.WriteLine("DKIM Signed Mail Sent!") |
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