Zig

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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Zig

const std = @import("std");
const chilkat = @import("chilkat");

pub fn main() !void {
    // 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).

    const mailman = try chilkat.MailMan.init();
    defer mailman.deinit();

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

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

    if (connected) {
        std.debug.print("Successfully connected to the SMTP server.\n", .{});
    } else {
        std.debug.print("Could not connect to the SMTP server.\n", .{});
    }
}