Dart

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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Dart

import 'package:chilkat/chilkat.dart';

void main() {
  // 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.

  final mailman = CkMailMan();

  // Configure the POP3 server connection.
  mailman.mailHost = 'pop.example.com';
  mailman.mailPort = 995;
  mailman.popSsl = true;
  mailman.popUsername = 'user@example.com';
  mailman.popPassword = 'myPassword';

  // Begin a POP3 session.

  try {
    mailman.pop3BeginSession();
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // Send a NOOP to keep the session alive.
  try {
    mailman.pop3Noop();
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  print('POP3 NOOP succeeded.');
}