PHP

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

use Chilkat2\MailMan;

// 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 MailMan();

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

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

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