Send S/MIME Signed Email

Send digitally signed email using the digital certificate of the recipient. To successfully sign, the sender's certificate must be pre-installed with private key. Typically, this is done via a .pfx file, or through Internet Explorer. If your code is going to run within ASP, ASP.NET, or a Windows Service, you will need to follow the instructions here (http://blog.chilkatsoft.com/?p=149) to import your certificate w/ private key such that it is accessible by the calling process.

Download Chilkat Java Library

import com.chilkatsoft.*;

public class ChilkatExample {

  static {
    try {
        System.loadLibrary("chilkat");
    } catch (UnsatisfiedLinkError e) {
      System.err.println("Native code library failed to load.\n" + e);
      System.exit(1);
    }
  }

  public static void main(String argv[])
  {
    // The mailman object is used for sending and receiving email.
    CkMailMan mailman = new CkMailMan();

    // Any string argument automatically begins the 30-day trial.
    boolean success;
    success = mailman.UnlockComponent("30-day trial");
    if (success != true) {
        System.out.println("Component unlock failed");
        return;
    }

    // Set the SMTP server.
    mailman.put_SmtpHost("smtp.comcast.net");

    // Create a new email object
    CkEmail email = new CkEmail();

    email.put_Subject("This email is signed");
    email.put_Body("This is a digitally signed mail");
    email.put_From("Chilkat Support <admin@chilkatsoft.com>");
    email.AddTo("TagTooga","admin@tagtooga.com");

    // In this example, we've already installed the certificate for "admin@chilkatsoft.com"
    // (with private key) in the current user's personal certificate store.
    // If the email.SendSigned property is set, Chilkat will
    // automatically search for and use the first non-expired certificate
    // matching the sender's email address.  Chilkat searches
    // the Current User's Personal certificate store, as well
    // as the Local Machine's Personal certificate store.
    // Run certmgr.msc to view the certs in the Current User's
    // certificate store.
    email.put_SendSigned(true);

    success = mailman.SendEmail(email);
    if (success != true) {
        System.out.println(mailman.lastErrorText());
    }
    else {
        System.out.println("Mail Sent!");
    }

  }
}