Pascal (Lazarus/Delphi)

Send a POP3 RSET to Unmark Deletions

Demonstrates the Chilkat MailMan.Pop3Reset method, which sends the POP3 RSET command to the server. Any messages marked for deletion during the current session are unmarked and remain in the mailbox, and the POP3 session stays open. This example marks a message for deletion, then clears the mark with RSET.

Background: RSET is POP3's in-session undo for deletion marks. It differs from Pop3EndSessionNoQuit, which also discards pending deletions but closes the connection. With RSET the authenticated session continues, so you can clear the marks and keep working — handy when a processing step fails partway and you want to retry without reconnecting.

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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;

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

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

begin
  success := False;

  //  Demonstrates the MailMan.Pop3Reset method, which sends the POP3 RSET command.  Any
  //  messages marked for deletion during the current session are unmarked and remain in the
  //  mailbox.  The POP3 session stays open.

  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';

  success := mailman.Pop3BeginSession();
  if (success = False) then
    begin
      WriteLn(mailman.LastErrorText);
      Exit;
    end;

  //  Mark a message for deletion...
  success := mailman.DeleteByMsgnum(1);
  if (success = False) then
    begin
      WriteLn(mailman.LastErrorText);
      Exit;
    end;

  //  ...then change your mind: RSET unmarks all pending deletions but keeps the session open.
  success := mailman.Pop3Reset();
  if (success = False) then
    begin
      WriteLn(mailman.LastErrorText);
      Exit;
    end;

  //  Ending the session now commits nothing, because the marks were cleared.
  success := mailman.Pop3EndSession();
  if (success = False) then
    begin
      WriteLn(mailman.LastErrorText);
      Exit;
    end;

  WriteLn('Pending deletions were unmarked with RSET.');


  mailman.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.