PHP

Open a Persistent SMTP Connection

Demonstrates the Chilkat MailMan.OpenSmtpConnection method, which explicitly opens a connection to the SMTP server and authenticates if a username and password, OAuth2 token, or other applicable settings have been provided. This example opens the connection, notes where sending would occur, and closes it.

Background: By default, sending a single email opens a connection, sends, and closes it. When sending many messages, that per-message overhead adds up. Explicitly calling OpenSmtpConnection once, sending in a loop, then CloseSmtpConnection keeps a single authenticated session open for the whole batch — substantially faster and gentler on the server than reconnecting each time.

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Chilkat2 PHP

<?php

use Chilkat2\MailMan;

// Demonstrates the MailMan.OpenSmtpConnection method, which explicitly opens a connection
// to the SMTP server and authenticates if credentials (or an OAuth2 token) have been
// provided.

$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';

// Explicitly open (and authenticate) the SMTP connection.

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

echo "SMTP connection opened.\n";

// ... send one or more emails here ...

// Close the connection when done.
try {
    $mailman->CloseSmtpConnection();
} catch (\Chilkat2\Exception $e) {
    echo $e->getMessage(), "\n";
    exit;
}