Dart

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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Dart

import 'package:chilkat/chilkat.dart';

void main() {
  // 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).

  final mailman = CkMailMan();

  // Configure the SMTP server connection.
  mailman.smtpHost = 'smtp.example.com';
  mailman.smtpPort = 465;
  mailman.smtpSsl = true;

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

  if (connected) {
    print('Successfully connected to the SMTP server.');
  } else {
    print('Could not connect to the SMTP server.');
  }
}