(Node.js) Send Signed Email using PFX File

Demonstrates how to send a signed email using a digital certificate w/ private key stored in a PFX file.

Install Chilkat for Node.js and Electron using npm at Chilkat npm packages for Node.js Chilkat npm packages for Electron on Windows, Linux, MacOS

var os = require('os');
if (os.platform() == 'win32') {  
  var chilkat = require('@chilkat/ck-node23-win64'); 
} else if (os.platform() == 'linux') {
    if (os.arch() == 'arm') {
        var chilkat = require('@chilkat/ck-node23-linux-arm');
    } else if (os.arch() == 'arm64') {
        var chilkat = require('@chilkat/ck-node23-linux-arm64');
    } else {
        var chilkat = require('@chilkat/ck-node23-linux-x64');
    }
} else if (os.platform() == 'darwin') {
  var chilkat = require('@chilkat/ck-node23-mac-universal');
}

function chilkatExample() {

    // 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.
    var mailman = new chilkat.MailMan();

    // Set the SMTP server.
    mailman.SmtpHost = "smtp.mymailserver.com";

    // Create a new email object
    var email = new chilkat.Email();

    email.Subject = "This email is signed";
    email.Body = "This is a digitally signed mail";
    email.From = "Chilkat Admin <admin@chilkatsoft.com>";
    var success = email.AddTo("Chilkat Support","support@chilkatsoft.com");

    // Indicate that the email should be sent signed.
    email.SendSigned = true;

    // Tell the mailman to use a PFX file as a source for locating
    // the certificate and private key required for signing.
    // The certificate chosen for signing will be the one that
    // matches the sender's email address, which also has
    // a private key.  All intermediate certs in the chain of 
    // authentication, up to and including the root, will
    // be included in the signature.
    success = mailman.AddPfxSourceFile("/pfx_files/chilkatsoft_secret.pfx","secret");
    if (success !== true) {
        console.log(mailman.LastErrorText);
        return;
    }

    // Signed email can be sent in two different ways.  
    // In a multipart/signed email, the signature is attached as a separate MIME part.
    // In an opaque email (signedData) the content of the email is encapsulated within the signature
    // and the email is sent as "application/pkcs7-mime". 
    // Either should be fine, but some receiving systems might require one or the other..
    mailman.OpaqueSigning = false;

    // Send a signed email.
    success = mailman.SendEmail(email);
    if (success !== true) {
        console.log(mailman.LastErrorText);
    }
    else {
        // The LastErrorText property provides information
        // even when successful.
        console.log(mailman.LastErrorText);
        console.log("Mail Sent!");
    }


}

chilkatExample();