PHP

Send an SMTP NOOP Command

Demonstrates the Chilkat MailMan.SmtpNoop method, which sends an SMTP NOOP command to the server. NOOP does nothing except elicit a positive response, which is useful for keeping a connection alive or verifying it is still responsive. This example opens an SMTP connection, sends a NOOP, and closes.

Background: When holding an SMTP connection open across many sends (see OpenSmtpConnection), an idle stretch can cause the server to time out and drop the socket. A periodic NOOP keeps the session active and confirms the server is still responding, so the next SendEmail doesn't fail on a silently-closed connection.

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Chilkat2 PHP

<?php

use Chilkat2\MailMan;

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

$mailman = new MailMan();

// Configure the SMTP server connection.
$mailman->SmtpHost = 'smtp.example.com';
$mailman->SmtpPort = 465;
$mailman->SmtpSsl = true;
$mailman->SmtpUsername = 'user@example.com';
$mailman->SmtpPassword = 'myPassword';

// Open the SMTP connection.

try {
    $mailman->OpenSmtpConnection();

    // Send a NOOP to keep the connection alive.
    $mailman->SmtpNoop();

    $mailman->CloseSmtpConnection();
} catch (\Chilkat2\Exception $e) {
    echo $e->getMessage(), "\n";
    exit;
}

echo "SMTP NOOP succeeded.\n";