Delphi ActiveX

Sending S/MIME Encrypted Email

Sends an encrypted email using the recipient's digital certificate from a .cer file. Delphi ActiveX

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Chilkat_TLB;

...

procedure TForm1.Button1Click(Sender: TObject);
var
success: Integer;
mailman: TChilkatMailMan;
cert: TChilkatCert;
email: TChilkatEmail;

begin
success := 0;

// 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.
mailman := TChilkatMailMan.Create(Self);

// Set the SMTP server.
mailman.SmtpHost := 'smtp.comcast.net';

// Load the .cer file into a certificate object.
// When sending S/MIME encrypted email, it is the recipient's
// certificate that is used for encryption.  Only the public key
// is needed to encrypt.  The recipient is the only
// one possessing the private key, and therefore is the only
// one able to decrypt.
cert := TChilkatCert.Create(Self);
success := cert.LoadFromFile('cknotes.cer');
if (success = 0) then
  begin
    Memo1.Lines.Add(cert.LastErrorText);
    Exit;
  end;

// Create a new email object
email := TChilkatEmail.Create(Self);

email.Subject := 'This email is encrypted';
email.Body := 'This is a digitally encrypted mail';
email.From := 'Chilkat Support <support@chilkatsoft.com>';
success := email.AddTo('Chilkat Blog','admin@cknotes.com');

// Indicate that the email is to be sent encrypted.
email.SendEncrypted := 1;

// Specify the certificate to be used for encryption.
success := email.SetEncryptCert(cert.ControlInterface);

success := mailman.SendEmail(email.ControlInterface);
if (success <> 1) then
  begin
    Memo1.Lines.Add(mailman.LastErrorText);
  end
else
  begin
    Memo1.Lines.Add('Mail Sent!');
  end;
end;