Visual FoxPro

Send DKIM Signed Email

See more DKIM / DomainKey Examples

Demonstrates how to send DKIM signed email. Visual FoxPro

LOCAL lnSuccess
LOCAL loMailman
LOCAL loDkim
LOCAL loEmail
LOCAL loBdMime
LOCAL lcPassword
LOCAL loPrivKey
LOCAL lcStrRecipients
LOCAL lcStrFrom

lnSuccess = 0

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

loMailman = CreateObject('Chilkat.MailMan')
loDkim = CreateObject('Chilkat.Dkim')

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

loEmail = CreateObject('Chilkat.Email')

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

* Add some recipients (BCC recipients are added below)
loEmail.AddTo("Chilkat Software","chilkat_software@yahoo.com")
loEmail.AddTo("Chilkat Admin","admin@chilkatsoft.com")
loEmail.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...
loBdMime = CreateObject('Chilkat.BinData')
lnSuccess = loMailman.RenderToMimeBd(loEmail,loBdMime)
IF (lnSuccess = 0) THEN
    ? loMailman.LastErrorText
    RELEASE loMailman
    RELEASE loDkim
    RELEASE loEmail
    RELEASE loBdMime
    CANCEL
ENDIF

* 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..
loDkim.DkimDomain = "chilkatsoft.com"
loDkim.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.
lcPassword = "passwd"
loPrivKey = CreateObject('Chilkat.PrivateKey')
lnSuccess = loPrivKey.LoadAnyFormatFile("qa_data/pem/rsa_passwd.pem",lcPassword)
IF (lnSuccess = 0) THEN
    ? loPrivKey.LastErrorText
    RELEASE loMailman
    RELEASE loDkim
    RELEASE loEmail
    RELEASE loBdMime
    RELEASE loPrivKey
    CANCEL
ENDIF

lnSuccess = loDkim.SetDkimPrivateKey(loPrivKey)
IF (lnSuccess = 0) THEN
    ? loDkim.LastErrorText
    RELEASE loMailman
    RELEASE loDkim
    RELEASE loEmail
    RELEASE loBdMime
    RELEASE loPrivKey
    CANCEL
ENDIF

* Add the DKIM-Signature header to the MIME in bdMime
lnSuccess = loDkim.DkimSign(loBdMime)
IF (lnSuccess = 0) THEN
    ? loDkim.LastErrorText
    RELEASE loMailman
    RELEASE loDkim
    RELEASE loEmail
    RELEASE loBdMime
    RELEASE loPrivKey
    CANCEL
ENDIF

* If desired, examine the MIME of the email being sent.
loBdMime.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")
lcStrRecipients = "chilkat_software@yahoo.com, admin@chilkatsoft.com, admin@chilkat.io, chilkat.support@gmail.com"
lcStrFrom = "support@chilkatsoft.com"

lnSuccess = loMailman.SendMimeBd(lcStrFrom,lcStrRecipients,loBdMime)
IF (lnSuccess = 0) THEN
    ? loMailman.LastErrorText
    RELEASE loMailman
    RELEASE loDkim
    RELEASE loEmail
    RELEASE loBdMime
    RELEASE loPrivKey
    CANCEL
ENDIF

lnSuccess = loMailman.CloseSmtpConnection()
IF (lnSuccess <> 1) THEN
    ? "Connection to SMTP server not closed cleanly."
ENDIF

? "DKIM Signed Mail Sent!"

RELEASE loMailman
RELEASE loDkim
RELEASE loEmail
RELEASE loBdMime
RELEASE loPrivKey