(Delphi ActiveX) SMTP GMail Send using App Password

See more GMail SMTP/IMAP/POP Examples

Demonstrates how to authenticate using an app password with GMail for SMTP (port 465 using implicit SSL/TLS).

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;
success: Integer;

begin
// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

// Starting May 30, 2022, Google will no longer support the use of third-party apps or devices 
// which ask you to sign in to your Google Account using only your username and password.

// Instead of authenticating with your GMail username/password, a GMail user can create an App Password
// and then login using their username/app_password.   It's literally the same, except it allows a GMail
// account owner to isolate passwords to specific applications.

// The Gmail account owner would first need to make sure she has 2-Step Verification setup for her account.
// Note: The 2FA verification is not a factor when authenticating with an app password. The 2FA is required
// to setup app passwords in the Google account console.  See Sign in with App Passwords

// After the GMail account owner has setup his app password, he simply uses the app password instead of his GMail account password.

mailman := TChilkatMailMan.Create(Self);

mailman.SmtpHost := 'smtp.gmail.com';

mailman.SmtpUsername := 'user@gmail.com';
mailman.SmtpPassword := 'srnyyvqajocnsvdp';

mailman.SmtpSsl := 1;
mailman.SmtpPort := 465;

success := mailman.SmtpConnect();
if (success = 0) then
  begin
    Memo1.Lines.Add(mailman.LastErrorText);
    Exit;
  end;

success := mailman.SmtpAuthenticate();
if (success = 0) then
  begin
    Memo1.Lines.Add(mailman.LastErrorText);
    Exit;
  end;

Memo1.Lines.Add('SMTP Success!');
end;