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(Unicode C) Send DKIM Signed EmailDemonstrates how to send DKIM signed email.
#include <C_CkMailManW.h> #include <C_CkDkimW.h> #include <C_CkEmailW.h> #include <C_CkBinDataW.h> #include <C_CkPrivateKeyW.h> void ChilkatSample(void) { BOOL success; HCkMailManW mailman; HCkDkimW dkim; HCkEmailW email; HCkBinDataW bdMime; const wchar_t *password; HCkPrivateKeyW privKey; const wchar_t *strRecipients; const wchar_t *strFrom; // This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. mailman = CkMailManW_Create(); dkim = CkDkimW_Create(); // SMTP server settings... CkMailManW_putSmtpHost(mailman,L"SMTP_DOMAIN"); CkMailManW_putSmtpUsername(mailman,L"SMTP_LOGIN"); CkMailManW_putSmtpPassword(mailman,L"SMTP_PASSWORD"); CkMailManW_putSmtpPort(mailman,465); CkMailManW_putSmtpSsl(mailman,TRUE); email = CkEmailW_Create(); CkEmailW_putSubject(email,L"This is a test"); CkEmailW_putBody(email,L"This is a test"); CkEmailW_putFrom(email,L"Chilkat Support <support@chilkatsoft.com>"); // Add some recipients (BCC recipients are added below) CkEmailW_AddTo(email,L"Chilkat Software",L"chilkat_software@yahoo.com"); CkEmailW_AddTo(email,L"Chilkat Admin",L"admin@chilkatsoft.com"); CkEmailW_AddCC(email,L"Chilkat Admin",L"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... bdMime = CkBinDataW_Create(); success = CkMailManW_RenderToMimeBd(mailman,email,bdMime); if (success != TRUE) { wprintf(L"%s\n",CkMailManW_lastErrorText(mailman)); CkMailManW_Dispose(mailman); CkDkimW_Dispose(dkim); CkEmailW_Dispose(email); CkBinDataW_Dispose(bdMime); 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.. CkDkimW_putDkimDomain(dkim,L"chilkatsoft.com"); CkDkimW_putDkimSelector(dkim,L"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. password = L"passwd"; privKey = CkPrivateKeyW_Create(); success = CkPrivateKeyW_LoadAnyFormatFile(privKey,L"qa_data/pem/rsa_passwd.pem",password); if (success != TRUE) { wprintf(L"%s\n",CkPrivateKeyW_lastErrorText(privKey)); CkMailManW_Dispose(mailman); CkDkimW_Dispose(dkim); CkEmailW_Dispose(email); CkBinDataW_Dispose(bdMime); CkPrivateKeyW_Dispose(privKey); return; } success = CkDkimW_SetDkimPrivateKey(dkim,privKey); if (success != TRUE) { wprintf(L"%s\n",CkDkimW_lastErrorText(dkim)); CkMailManW_Dispose(mailman); CkDkimW_Dispose(dkim); CkEmailW_Dispose(email); CkBinDataW_Dispose(bdMime); CkPrivateKeyW_Dispose(privKey); return; } // Add the DKIM-Signature header to the MIME in bdMime success = CkDkimW_DkimSign(dkim,bdMime); if (success != TRUE) { wprintf(L"%s\n",CkDkimW_lastErrorText(dkim)); CkMailManW_Dispose(mailman); CkDkimW_Dispose(dkim); CkEmailW_Dispose(email); CkBinDataW_Dispose(bdMime); CkPrivateKeyW_Dispose(privKey); return; } // If desired, examine the MIME of the email being sent. CkBinDataW_WriteFile(bdMime,L"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") strRecipients = L"chilkat_software@yahoo.com, admin@chilkatsoft.com, admin@chilkat.io, chilkat.support@gmail.com"; strFrom = L"support@chilkatsoft.com"; success = CkMailManW_SendMimeBd(mailman,strFrom,strRecipients,bdMime); if (success != TRUE) { wprintf(L"%s\n",CkMailManW_lastErrorText(mailman)); CkMailManW_Dispose(mailman); CkDkimW_Dispose(dkim); CkEmailW_Dispose(email); CkBinDataW_Dispose(bdMime); CkPrivateKeyW_Dispose(privKey); return; } success = CkMailManW_CloseSmtpConnection(mailman); if (success != TRUE) { wprintf(L"Connection to SMTP server not closed cleanly.\n"); } wprintf(L"DKIM Signed Mail Sent!\n"); CkMailManW_Dispose(mailman); CkDkimW_Dispose(dkim); CkEmailW_Dispose(email); CkBinDataW_Dispose(bdMime); CkPrivateKeyW_Dispose(privKey); } |
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