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(Mono C#) Send DKIM Signed EmailDemonstrates how to send DKIM signed email.
// This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. bool success; Chilkat.MailMan mailman = new Chilkat.MailMan(); Chilkat.Dkim dkim = new Chilkat.Dkim(); // SMTP server settings... mailman.SmtpHost = "SMTP_DOMAIN"; mailman.SmtpUsername = "SMTP_LOGIN"; mailman.SmtpPassword = "SMTP_PASSWORD"; mailman.SmtpPort = 465; mailman.SmtpSsl = true; Chilkat.Email email = 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) email.AddTo("Chilkat Software","chilkat_software@yahoo.com"); email.AddTo("Chilkat Admin","admin@chilkatsoft.com"); 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... Chilkat.BinData bdMime = new Chilkat.BinData(); success = mailman.RenderToMimeBd(email,bdMime); if (success != true) { Debug.WriteLine(mailman.LastErrorText); return; } // 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. string password = "passwd"; Chilkat.PrivateKey privKey = new Chilkat.PrivateKey(); success = privKey.LoadAnyFormatFile("qa_data/pem/rsa_passwd.pem",password); if (success != true) { Debug.WriteLine(privKey.LastErrorText); return; } success = dkim.SetDkimPrivateKey(privKey); if (success != true) { Debug.WriteLine(dkim.LastErrorText); return; } // Add the DKIM-Signature header to the MIME in bdMime success = dkim.DkimSign(bdMime); if (success != true) { Debug.WriteLine(dkim.LastErrorText); return; } // If desired, examine the MIME of the email being sent. 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") string strRecipients = "chilkat_software@yahoo.com, admin@chilkatsoft.com, admin@chilkat.io, chilkat.support@gmail.com"; string strFrom = "support@chilkatsoft.com"; success = mailman.SendMimeBd(strFrom,strRecipients,bdMime); if (success != true) { Debug.WriteLine(mailman.LastErrorText); return; } success = mailman.CloseSmtpConnection(); if (success != true) { Debug.WriteLine("Connection to SMTP server not closed cleanly."); } Debug.WriteLine("DKIM Signed Mail Sent!"); |
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