PHP

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.

Chilkat PHP Downloads

Download Chilkat for PHP

Chilkat2 PHP

<?php

use Chilkat2\MailMan;

// 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 = new MailMan();

// 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();

    // Send a NOOP to keep the session alive.
    $mailman->Pop3Noop();
} catch (\Chilkat2\Exception $e) {
    echo $e->getMessage(), "\n";
    exit;
}

echo "POP3 NOOP succeeded.\n";