Lazarus Pascal

Delete a POP3 Message via an Email Object

Demonstrates the Chilkat MailMan.DeleteEmail method, which deletes a POP3 message using the UIDL stored in the X-UIDL header of an Email object. The email must contain an X-UIDL header, which it does after being fetched from the server. This example fetches a message and then deletes it.

Background: When Chilkat downloads a POP3 message it records the server UIDL in an X-UIDL header on the Email object. DeleteEmail uses that header to tell the server which message to remove — a natural "process then delete" flow: fetch a message, act on it, then delete it. As always in POP3, the deletion is only committed when the session ends (unless ImmediateDelete is set).

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Lazarus Pascal

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;

  //  Demonstrates the MailMan.DeleteEmail method, which deletes a POP3 message using the UIDL
  //  stored in the X-UIDL header of an Email object.  The email must contain an X-UIDL header
  //  (as it does after being fetched from the server).

  mailman := TMailMan.Create;

  //  Configure the POP3 server connection.
  mailman.MailHost := 'pop.example.com';
  mailman.MailPort := 995;
  mailman.PopSsl := True;
  mailman.PopUsername := 'user@example.com';
  mailman.PopPassword := 'myPassword';

  //  Fetch a message (headers are enough; the X-UIDL header identifies it on the server).
  email := TEmail.Create;

  success := mailman.FetchOne(True,0,1,email);
  if (success = False) then
    begin
      WriteLn(mailman.LastErrorText);
      Exit;
    end;

  //  Delete that message using its X-UIDL header.
  success := mailman.DeleteEmail(email);
  if (success = False) then
    begin
      WriteLn(mailman.LastErrorText);
      Exit;
    end;

  //  Unless the ImmediateDelete property is set to True, the message is only marked for
  //  deletion.  End the POP3 session (which sends the QUIT command) to commit the deletion.
  success := mailman.Pop3EndSession();
  if (success = False) then
    begin
      WriteLn(mailman.LastErrorText);
      Exit;
    end;

  WriteLn('Deleted the email from the POP3 server.');

  //  Note: Explicitly connecting/authenticating is optional.  Chilkat MailMan automatically
  //  connects and authenticates -- using the property settings above -- whenever a server
  //  operation requires it.  Calling the explicit connect/authenticate methods can still be
  //  helpful to determine whether a failure occurs while connecting or while authenticating.


  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.