Zig

Send an SMTP NOOP Command

Demonstrates the Chilkat MailMan.SmtpNoop method, which sends an SMTP NOOP command to the server. NOOP does nothing except elicit a positive response, which is useful for keeping a connection alive or verifying it is still responsive. This example opens an SMTP connection, sends a NOOP, and closes.

Background: When holding an SMTP connection open across many sends (see OpenSmtpConnection), an idle stretch can cause the server to time out and drop the socket. A periodic NOOP keeps the session active and confirms the server is still responding, so the next SendEmail doesn't fail on a silently-closed connection.

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Zig

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

pub fn main(init: std.process.Init) !void {
    const alloc = init.arena.allocator();

    // Demonstrates the MailMan.SmtpNoop method, which sends an SMTP NOOP command to the server.
    // NOOP does nothing except elicit a positive response, useful for keeping a connection
    // alive or verifying it is still responsive.

    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);
    mailman.setSmtpUsername("user@example.com");
    mailman.setSmtpPassword("myPassword");

    // Open the SMTP connection.

    mailman.openSmtpConnection() catch {
        std.debug.print("{s}\n", .{try mailman.getLastErrorText(alloc)});
        return;
    };

    // Send a NOOP to keep the connection alive.
    mailman.smtpNoop() catch {
        std.debug.print("{s}\n", .{try mailman.getLastErrorText(alloc)});
        return;
    };

    mailman.closeSmtpConnection() catch {
        std.debug.print("{s}\n", .{try mailman.getLastErrorText(alloc)});
        return;
    };

    std.debug.print("SMTP NOOP succeeded.\n", .{});
}