(Delphi DLL) Office365 Send Email using SMTP with OAuth2 Authentication

See more Office365 Examples

Demonstrates how to send email from smtp.office365.com using OAuth2 authentication.

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

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

...

procedure TForm1.Button1Click(Sender: TObject);
var
jsonToken: HCkJsonObject;
success: Boolean;
mailman: HCkMailMan;
email: HCkEmail;

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

// An Office365 OAuth2 access token must first be obtained prior
// to running this code.

// Getting the OAuth2 access token for the 1st time requires the O365 account owner's 
// interactive authorization via a web browser.  Afterwards, the access token
// can be repeatedly refreshed automatically (with no user interaction).

// See the following examples for getting and refreshing an OAuth2 access token

// Get Office365 SMTP/IMAP/POP3 OAuth2 Access Token
// Refresh Office365 SMTP/IMAP/POP3 OAuth2 Access Token

// First get our previously obtained OAuth2 access token.
jsonToken := CkJsonObject_Create();
success := CkJsonObject_LoadFile(jsonToken,'qa_data/tokens/office365.json');

mailman := CkMailMan_Create();

CkMailMan_putSmtpHost(mailman,'smtp.office365.com');
CkMailMan_putSmtpPort(mailman,587);
CkMailMan_putStartTLS(mailman,True);

// Use your Office365 email address for the SmtpUsername.
CkMailMan_putSmtpUsername(mailman,'OFFICE365_EMAIL_ADDRESS');
CkMailMan_putOAuth2AccessToken(mailman,CkJsonObject__stringOf(jsonToken,'access_token'));

// Create a new email object
email := CkEmail_Create();

CkEmail_putSubject(email,'This is a test');
CkEmail_putBody(email,'This is a test');
CkEmail_putFrom(email,'MY_NAME <OFFICE365_EMAIL_ADDRESS>');
success := CkEmail_AddTo(email,'John Doe','somebody@example.com');

// Call SendEmail to connect to the SMTP server and send.
// The connection (i.e. session) to the SMTP server remains
// open so that subsequent SendEmail calls may use the
// same connection.  
success := CkMailMan_SendEmail(mailman,email);
if (success <> True) then
  begin
    Memo1.Lines.Add(CkMailMan__lastErrorText(mailman));
    Exit;
  end;

// If SendEmail failed because of "Failed to get initial SMTP Response", then it may be 
// a firewall or anti-virus blocking communications.
// See https://cknotes.com/smtp-office365-com-failed-to-get-initial-smtp-response/

success := CkMailMan_CloseSmtpConnection(mailman);
if (success <> True) then
  begin
    Memo1.Lines.Add('Connection to SMTP server not closed cleanly.');
  end;

Memo1.Lines.Add('Mail Sent!');

CkJsonObject_Dispose(jsonToken);
CkMailMan_Dispose(mailman);
CkEmail_Dispose(email);

end;