Xojo Plugin

Send DKIM Signed Email

See more DKIM / DomainKey Examples

Demonstrates how to send DKIM signed email. Xojo Plugin

Dim success As Boolean
success = False

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

Dim mailman As New Chilkat.MailMan
Dim dkim As New Chilkat.Dkim

// SMTP server settings...
mailman.SmtpHost = "SMTP_DOMAIN"
mailman.SmtpUsername = "SMTP_LOGIN"
mailman.SmtpPassword = "SMTP_PASSWORD"
mailman.SmtpPort = 465
mailman.SmtpSsl = True

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>"

// Add some recipients (BCC recipients are added below)
success = email.AddTo("Chilkat Software","chilkat_software@yahoo.com")
success = email.AddTo("Chilkat Admin","admin@chilkatsoft.com")
success = email.AddCC("Chilkat Admin","admin@chilkat.io")

// When sending an email with a DKIM signature, the MIME
// of the email must not be modified prior to
// or during the sending process.  Therefore, the MIME of the
// email is assembled, the DKIM signature is added, and then
// SendMimeBd is called to send the email.

// First get the MIME of the email.  Calling RenderToMimeBd 
// causes the email to be signed and/or encrypted if those options
// have been selected.  The MIME returned by RenderToMimeBd
// 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 bdMime As New Chilkat.BinData
success = mailman.RenderToMimeBd(email,bdMime)
If (success = False) Then
    System.DebugLog(mailman.LastErrorText)
    Return
End If

// To create a DKIM signature,
// 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
// an empty password string argument, but it is ignored.
Dim password As String
password = "passwd"
Dim privKey As New Chilkat.PrivateKey
success = privKey.LoadAnyFormatFile("qa_data/pem/rsa_passwd.pem",password)
If (success = False) Then
    System.DebugLog(privKey.LastErrorText)
    Return
End If

success = dkim.SetDkimPrivateKey(privKey)
If (success = False) Then
    System.DebugLog(dkim.LastErrorText)
    Return
End If

// Add the DKIM-Signature header to the MIME in bdMime
success = dkim.DkimSign(bdMime)
If (success = False) Then
    System.DebugLog(dkim.LastErrorText)
    Return
End If

// If desired, examine the MIME of the email being sent.
success = bdMime.WriteFile("qa_output/dkimSigned.eml")

// ---- Prepare to send the email contained in bdMime ---

// To send to multiple email addresses, the strRecipients should be set to a comma-separated
// list of email addresses.

// Note: This is where we can add additional BCC addreses.
// Here we are adding "chilkat.support@gmail.com" as an additional BCC address.
// Notice that the 1st three email addresses are NOT BCC because these email addresses
// appear in the MIME header of the email (in the "To" and "CC" header fields).
// A BCC email address does not appear in the MIME, and thus the non-BCC recipients cannot see
// that the email was also sent to the BCC address.  (BCC means "blind carbon copy")
Dim strRecipients As String
strRecipients = "chilkat_software@yahoo.com, admin@chilkatsoft.com, admin@chilkat.io, chilkat.support@gmail.com"
Dim strFrom As String
strFrom = "support@chilkatsoft.com"

success = mailman.SendMimeBd(strFrom,strRecipients,bdMime)
If (success = False) Then
    System.DebugLog(mailman.LastErrorText)
    Return
End If

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

System.DebugLog("DKIM Signed Mail Sent!")