Delphi ActiveX

Send a POP3 NOOP Command

Demonstrates the Chilkat MailMan.Pop3Noop method, which sends a POP3 NOOP command to the server. NOOP does nothing except elicit a positive response, which is useful for keeping a session alive or verifying the connection is still responsive. This example begins a POP3 session and sends a NOOP.

Background: NOOP ("no operation") is a standard keep-alive across many internet protocols. Servers often drop idle connections after a timeout; sending a periodic NOOP resets that timer so a long-running session stays open. It also serves as a cheap "are you still there?" probe — a successful reply confirms the socket and the authenticated session are still healthy.

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var
success: Integer;
mailman: TChilkatMailMan;

begin
success := 0;

//  Demonstrates the MailMan.Pop3Noop method, which sends a POP3 NOOP command to the server.
//  NOOP does nothing except elicit a positive response, which is useful for keeping a
//  session alive or verifying the connection is still responsive.

mailman := TChilkatMailMan.Create(Self);

//  Configure the POP3 server connection.
mailman.MailHost := 'pop.example.com';
mailman.MailPort := 995;
mailman.PopSsl := 1;
mailman.PopUsername := 'user@example.com';
mailman.PopPassword := 'myPassword';

//  Begin a POP3 session.

success := mailman.Pop3BeginSession();
if (success = 0) then
  begin
    Memo1.Lines.Add(mailman.LastErrorText);
    Exit;
  end;

//  Send a NOOP to keep the session alive.
success := mailman.Pop3Noop();
if (success = 0) then
  begin
    Memo1.Lines.Add(mailman.LastErrorText);
    Exit;
  end;

Memo1.Lines.Add('POP3 NOOP succeeded.');