Pascal (Lazarus/Delphi)

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. Pascal (Lazarus/Delphi)

program ChilkatDemo;

// Demonstrates using the Chilkat Pascal wrapper via the C bridge DLL.
// Builds as a console application under Lazarus (FPC) or Delphi.

{$IFDEF FPC}
  {$MODE DELPHI}
{$ENDIF}
{$APPTYPE CONSOLE}

uses
  {$IFDEF UNIX}
  cthreads,
  {$ENDIF}
  SysUtils,
  CkDllLoader,
  Chilkat.MailMan,
  Chilkat.Cert,
  Chilkat.Email;

// ---------------------------------------------------------------------------

procedure RunDemo;
var
  success: Boolean;
  mailman: TMailMan;
  cert1: TCert;
  cert2: TCert;
  cert3: TCert;
  email: TEmail;

begin
  success := False;

  //  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 := TMailMan.Create;

  //  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 := TCert.Create;
  success := cert1.LoadFromFile('recipient1.cer');
  if (success <> True) then
    begin
      WriteLn(cert1.LastErrorText);
      Exit;
    end;
  cert2 := TCert.Create;
  success := cert2.LoadFromFile('recipient2.cer');
  if (success <> True) then
    begin
      WriteLn(cert2.LastErrorText);
      Exit;
    end;
  cert3 := TCert.Create;
  success := cert3.LoadFromFile('recipient3.cer');
  if (success <> True) then
    begin
      WriteLn(cert3.LastErrorText);
      Exit;
    end;

  //  Create a new email object
  email := TEmail.Create;

  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) then
    begin
      success := email.AddEncryptCert(cert2);
    end;
  if (success = True) then
    begin
      success := email.AddEncryptCert(cert3);
    end;
  if (success <> True) then
    begin
      WriteLn(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 := True;

  //  Send the encrypted email...
  success := mailman.SendEmail(email);
  if (success <> True) then
    begin
      WriteLn(mailman.LastErrorText);
    end
  else
    begin
      WriteLn('Encrypted Email Sent!');
    end;


  mailman.Free;
  cert1.Free;
  cert2.Free;
  cert3.Free;
  email.Free;

end;

// ---------------------------------------------------------------------------

begin

  try
    RunDemo;
  except
    on E: Exception do
      WriteLn('Unhandled exception: ', E.ClassName, ': ', E.Message);
  end;

  WriteLn;
  {$IFDEF MSWINDOWS}
  WriteLn('Press Enter to exit...');
  ReadLn;
  {$ENDIF}
end.