Java

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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Chilkat2 Java

import com.chilkatsoft.chilkat2.MailMan;

public class ChilkatExample {

    public static void main(String[] args) {
        // 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 mailman = new MailMan();

        // Configure the SMTP server connection.
        mailman.setSmtpHost("smtp.example.com");
        mailman.setSmtpPort(465);
        mailman.setSmtpSsl(true);

        // Test connectivity to the SMTP server.
        boolean connected = mailman.verifySmtpConnection();

        if (connected) {
            System.out.println("Successfully connected to the SMTP server.");
        } else {
            System.out.println("Could not connect to the SMTP server.");
        }
    }
}