PHP Extension

Verify Connectivity to the SMTP Server

Demonstrates the Chilkat MailMan.VerifySmtpConnection method, which tests whether a TCP/IP connection can be established with the configured SMTP server. It verifies connectivity only — it does not authenticate. This example configures the SMTP host and checks whether it can be reached.

Background: When a send fails, it helps to know where it broke. VerifySmtpConnection isolates the first hop — can the client even reach the server on the configured host and port, and complete the TLS handshake? A failure here points at networking, firewall, DNS, port, or certificate issues rather than credentials. Once connectivity is confirmed, VerifySmtpLogin tests the authentication step.

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PHP Extension

<?php

include("chilkat.php");

//  Demonstrates the MailMan.VerifySmtpConnection method, which tests whether a TCP/IP
//  connection can be established with the configured SMTP server.  It verifies connectivity
//  only (it does not authenticate).

$mailman = new CkMailMan();

//  Configure the SMTP server connection.
$mailman->put_SmtpHost('smtp.example.com');
$mailman->put_SmtpPort(465);
$mailman->put_SmtpSsl(true);

//  Test connectivity to the SMTP server.
$connected = $mailman->VerifySmtpConnection();

if ($connected == true) {
    print 'Successfully connected to the SMTP server.' . "\n";
}
else {
    print 'Could not connect to the SMTP server.' . "\n";
}


?>