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(PHP Extension) Send DKIM Signed EmailDemonstrates how to create a simple email, add a DKIM signature, and send it. Note: Requires version 9.0.3 or greater.
<?php // The version number (9_5_0) should match version of the Chilkat extension used, omitting the micro-version number. // For example, if using Chilkat v9.5.0.48, then include as shown here: include("chilkat_9_5_0.php"); // 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. $mailman = new CkMailMan(); // The dkim object is used for creating the DKIM signature. $dkim = new CkDkim(); // Set the SMTP server. $mailman->put_SmtpHost('smtp.chilkatsoft.com'); // Set the SMTP login/password (if required) $mailman->put_SmtpUsername('myLogin'); $mailman->put_SmtpPassword('myPassword'); // Set the SmtpPort if your SMTP server uses an alternative port (default = 25) $mailman->put_SmtpPort(587); // Create a new email object $email = new CkEmail(); $email->put_Subject('This is a test'); $email->put_Body('This is a test'); $email->put_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. $success = $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... $mimeData = new CkByteData(); $success = $mailman->RenderToMimeBytes($email,$mimeData); if ($success != true) { print $mailman->lastErrorText() . "\n"; exit; } // 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->put_DkimDomain('chilkatsoft.com'); $dkim->put_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. $password = 'optionalPassword'; $privKey = new CkPrivateKey(); $success = $privKey->LoadAnyFormatFile('myPrivateKey.pem',$password); if ($success != true) { print $privKey->lastErrorText() . "\n"; exit; } $success = $dkim->SetDkimPrivateKey($privKey); if ($success != true) { print $dkim->lastErrorText() . "\n"; exit; } // Add the DKIM-Signature header and // returns the new MIME with DKIM-Signature added. $dkimSignedMime = new CkByteData(); $success = $dkim->AddDkimSignature($mimeData,$dkimSignedMime); if ($success != true) { print $dkim->lastErrorText() . "\n"; exit; } // 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. $strFrom = 'support@chilkatsoft.com'; // To send to multiple email addresses, the strTo should be set to a comma-separated // list of email addresses. $strTo = 'chilkat_software@yahoo.com, admin@chilkatsoft.com'; $success = $mailman->SendMimeBytes($strFrom,$strTo,$dkimSignedMime); if ($success != true) { print $mailman->lastErrorText() . "\n"; exit; } // 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) { print 'Connection to SMTP server not closed cleanly.' . "\n"; } print 'DKIM Signed Mail Sent!' . "\n"; ?> |
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