(Delphi ActiveX) 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.

Chilkat for Delphi Downloads Chilkat ActiveX DLL for Delphi Chilkat non-ActiveX DLL for Delphi * The examples here use the ActiveX DLL.

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
mailman: TChilkatMailMan;
cert1: TChilkatCert;
success: Integer;
cert2: TChilkatCert;
cert3: TChilkatCert;
email: TChilkatEmail;

begin
// 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.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.
cert1 := TChilkatCert.Create(Self);
success := cert1.LoadFromFile('recipient1.cer');
if (success <> 1) then
  begin
    Memo1.Lines.Add(cert1.LastErrorText);
    Exit;
  end;
cert2 := TChilkatCert.Create(Self);
success := cert2.LoadFromFile('recipient2.cer');
if (success <> 1) then
  begin
    Memo1.Lines.Add(cert2.LastErrorText);
    Exit;
  end;
cert3 := TChilkatCert.Create(Self);
success := cert3.LoadFromFile('recipient3.cer');
if (success <> 1) then
  begin
    Memo1.Lines.Add(cert3.LastErrorText);
    Exit;
  end;

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

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.ControlInterface);
if (success = 1) then
  begin
    success := email.AddEncryptCert(cert2.ControlInterface);
  end;
if (success = 1) then
  begin
    success := email.AddEncryptCert(cert3.ControlInterface);
  end;
if (success <> 1) then
  begin
    Memo1.Lines.Add(email.LastErrorText);
    Exit;
  end;

// 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 := 1;

// Send the encrypted email...
success := mailman.SendEmail(email.ControlInterface);
if (success <> 1) then
  begin
    Memo1.Lines.Add(mailman.LastErrorText);
  end
else
  begin
    Memo1.Lines.Add('Encrypted Email Sent!');
  end;
end;