Node.js

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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Node.js

NODEJS_PRELUDE

function chilkatExample() {

    var success = false;

    //  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.

    var mailman = new chilkat.MailMan();

    //  Configure the SMTP server connection.
    mailman.SmtpHost = "smtp.example.com";
    mailman.SmtpPort = 465;
    mailman.SmtpSsl = true;
    mailman.SmtpUsername = "user@example.com";
    mailman.SmtpPassword = "myPassword";

    //  Open the SMTP connection.

    success = mailman.OpenSmtpConnection();
    if (success == false) {
        console.log(mailman.LastErrorText);
        return true;
    }

    //  Send a NOOP to keep the connection alive.
    success = mailman.SmtpNoop();
    if (success == false) {
        console.log(mailman.LastErrorText);
        return true;
    }

    success = mailman.CloseSmtpConnection();
    if (success == false) {
        console.log(mailman.LastErrorText);
        return true;
    }

    console.log("SMTP NOOP succeeded.");

}

chilkatExample();