Pascal (Lazarus/Delphi)

SMTP using HTTP Proxy

Demonstrates how to communicate with an SMTP server via an HTTP proxy. 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.Email;

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

procedure RunDemo;
var
  success: Boolean;
  mailman: TMailMan;
  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;

  //  To connect through an HTTP proxy, set the HttpProxyHostname
  //  and HttpProxyPort properties to the hostname (or IP address)
  //  and port of the HTTP proxy.  Typical port numbers used by
  //  HTTP proxy servers are 3128 and 8080.
  mailman.HttpProxyHostname := 'www.my-http-proxy.com';
  mailman.HttpProxyPort := 3128;

  //  Important:  Your HTTP proxy server must allow non-HTTP
  //  traffic to pass.  Otherwise this does not work.

  //  Set the SMTP server.
  mailman.SmtpHost := 'smtp.chilkatsoft.com';

  //  Set the SMTP login/password (if required)
  mailman.SmtpUsername := 'myUsername';
  mailman.SmtpPassword := 'myPassword';

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

  email.Subject := 'This is a test';
  email.Body := 'This is a test';
  email.From := 'Chilkat Support <support@chilkatsoft.com>';
  success := email.AddTo('Chilkat Admin','admin@chilkatsoft.com');

  //  Call SendEmail to connect to the SMTP server via the HTTP proxy and send.
  //  The connection (i.e. session) to the SMTP server remains
  //  open so that subsequent SendEmail calls may use the
  //  same connection.  
  success := mailman.SendEmail(email);
  if (success <> True) then
    begin
      WriteLn(mailman.LastErrorText);
      Exit;
    end;

  //  Some SMTP servers do not actually send the email until 
  //  the connection is closed.  In these cases, it is necessary to
  //  call CloseSmtpConnection for the mail to be  sent.  
  //  Most SMTP servers send the email immediately, and it is 
  //  not required to close the connection.  We'll close it here
  //  for the example:
  success := mailman.CloseSmtpConnection();
  if (success <> True) then
    begin
      WriteLn('Connection to SMTP server not closed cleanly.');
    end;

  WriteLn('Mail Sent!');


  mailman.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.