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(PowerBuilder) Send DKIM Signed Email

Demonstrates how to send DKIM signed email.

Chilkat ActiveX Downloads

ActiveX for 32-bit and 64-bit Windows

integer li_rc
integer li_Success
oleobject loo_Mailman
oleobject loo_Dkim
oleobject loo_Email
oleobject loo_BdMime
string ls_Password
oleobject loo_PrivKey
string ls_StrRecipients
string ls_StrFrom

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

loo_Mailman = create oleobject
li_rc = loo_Mailman.ConnectToNewObject("Chilkat_9_5_0.MailMan")
if li_rc < 0 then
    destroy loo_Mailman
    MessageBox("Error","Connecting to COM object failed")
    return
end if
loo_Dkim = create oleobject
li_rc = loo_Dkim.ConnectToNewObject("Chilkat_9_5_0.Dkim")

// SMTP server settings...
loo_Mailman.SmtpHost = "SMTP_DOMAIN"
loo_Mailman.SmtpUsername = "SMTP_LOGIN"
loo_Mailman.SmtpPassword = "SMTP_PASSWORD"
loo_Mailman.SmtpPort = 465
loo_Mailman.SmtpSsl = 1

loo_Email = create oleobject
li_rc = loo_Email.ConnectToNewObject("Chilkat_9_5_0.Email")

loo_Email.Subject = "This is a test"
loo_Email.Body = "This is a test"
loo_Email.From = "Chilkat Support <support@chilkatsoft.com>"

// Add some recipients (BCC recipients are added below)
loo_Email.AddTo("Chilkat Software","chilkat_software@yahoo.com")
loo_Email.AddTo("Chilkat Admin","admin@chilkatsoft.com")
loo_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...
loo_BdMime = create oleobject
li_rc = loo_BdMime.ConnectToNewObject("Chilkat_9_5_0.BinData")

li_Success = loo_Mailman.RenderToMimeBd(loo_Email,loo_BdMime)
if li_Success <> 1 then
    Write-Debug loo_Mailman.LastErrorText
    destroy loo_Mailman
    destroy loo_Dkim
    destroy loo_Email
    destroy loo_BdMime
    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..
loo_Dkim.DkimDomain = "chilkatsoft.com"
loo_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.
ls_Password = "passwd"
loo_PrivKey = create oleobject
li_rc = loo_PrivKey.ConnectToNewObject("Chilkat_9_5_0.PrivateKey")

li_Success = loo_PrivKey.LoadAnyFormatFile("qa_data/pem/rsa_passwd.pem",ls_Password)
if li_Success <> 1 then
    Write-Debug loo_PrivKey.LastErrorText
    destroy loo_Mailman
    destroy loo_Dkim
    destroy loo_Email
    destroy loo_BdMime
    destroy loo_PrivKey
    return
end if

li_Success = loo_Dkim.SetDkimPrivateKey(loo_PrivKey)
if li_Success <> 1 then
    Write-Debug loo_Dkim.LastErrorText
    destroy loo_Mailman
    destroy loo_Dkim
    destroy loo_Email
    destroy loo_BdMime
    destroy loo_PrivKey
    return
end if

// Add the DKIM-Signature header to the MIME in bdMime
li_Success = loo_Dkim.DkimSign(loo_BdMime)
if li_Success <> 1 then
    Write-Debug loo_Dkim.LastErrorText
    destroy loo_Mailman
    destroy loo_Dkim
    destroy loo_Email
    destroy loo_BdMime
    destroy loo_PrivKey
    return
end if

// If desired, examine the MIME of the email being sent.
loo_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")
ls_StrRecipients = "chilkat_software@yahoo.com, admin@chilkatsoft.com, admin@chilkat.io, chilkat.support@gmail.com"
ls_StrFrom = "support@chilkatsoft.com"

li_Success = loo_Mailman.SendMimeBd(ls_StrFrom,ls_StrRecipients,loo_BdMime)
if li_Success <> 1 then
    Write-Debug loo_Mailman.LastErrorText
    destroy loo_Mailman
    destroy loo_Dkim
    destroy loo_Email
    destroy loo_BdMime
    destroy loo_PrivKey
    return
end if

li_Success = loo_Mailman.CloseSmtpConnection()
if li_Success <> 1 then
    Write-Debug "Connection to SMTP server not closed cleanly."
end if

Write-Debug "DKIM Signed Mail Sent!"


destroy loo_Mailman
destroy loo_Dkim
destroy loo_Email
destroy loo_BdMime
destroy loo_PrivKey

 

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