(Node.js) Send Encrypted Email to Multiple Recipients

Demonstrates how to create and send an S/MIME encrypted email to multiple recipients. The digital certificate of each recipient is required. The encrypting/sending process uses each recipient's digital certificate (which internally contains the public key). Each recipient decrypts the received email using his/her private key.

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

var os = require('os');
if (os.platform() == 'win32') {  
    if (os.arch() == 'ia32') {
        var chilkat = require('@chilkat/ck-node21-win-ia32');
    } else {
        var chilkat = require('@chilkat/ck-node21-win64'); 
    }
} else if (os.platform() == 'linux') {
    if (os.arch() == 'arm') {
        var chilkat = require('@chilkat/ck-node21-arm');
    } else if (os.arch() == 'x86') {
        var chilkat = require('@chilkat/ck-node21-linux32');
    } else {
        var chilkat = require('@chilkat/ck-node21-linux64');
    }
} else if (os.platform() == 'darwin') {
    if (os.arch() == 'arm64') {
        var chilkat = require('@chilkat/ck-node21-mac-m1');
    } else {
        var chilkat = require('@chilkat/ck-node21-macosx');
    }
}

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";

    // Load each recipient's certificate into a Chilkat certificate object.
    // This example loads the certificates from files.  However, the Chilkat
    // certificate object provides other means for loading certificates,
    // such as from in-memory PEM strings, or in-memory binary DER encoded form, etc.
    var cert1 = new chilkat.Cert();
    var success = cert1.LoadFromFile("recipient1.cer");
    if (success !== true) {
        console.log(cert1.LastErrorText);
        return;
    }

    var cert2 = new chilkat.Cert();
    success = cert2.LoadFromFile("recipient2.cer");
    if (success !== true) {
        console.log(cert2.LastErrorText);
        return;
    }

    var cert3 = new chilkat.Cert();
    success = cert3.LoadFromFile("recipient3.cer");
    if (success !== true) {
        console.log(cert3.LastErrorText);
        return;
    }

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

    email.Subject = "This email is encrypted and sent to 3 recipients";
    email.Body = "This is an S/MIME encrypted mail sent to 3 recipients";
    email.From = "Chilkat Support <support@chilkatsoft.com>";

    // Make each of the certificates available for encrypting the email
    // by calling AddEncryptCert for each.
    success = email.AddEncryptCert(cert1);
    if (success == true) {
        success = email.AddEncryptCert(cert2);
    }

    if (success == true) {
        success = email.AddEncryptCert(cert3);
    }

    if (success !== true) {
        console.log(email.LastErrorText);
        return;
    }

    // Add 3 recipients to the email (2 TO addresses, and 1 CC address)
    success = email.AddTo("Recipient 1","admin@cknotes.com");
    success = email.AddTo("Recipient 2","somebody001122@yahoo.com");
    success = email.AddCC("Recipient 3","somebody123xyz@gmail.com");

    // Indicate that the email is to be sent encrypted.
    email.SendEncrypted = true;

    // Send the encrypted email...
    success = mailman.SendEmail(email);
    if (success !== true) {
        console.log(mailman.LastErrorText);
    }
    else {
        console.log("Encrypted Email Sent!");
    }


}

chilkatExample();