Java

Send a POP3 NOOP Command

Demonstrates the Chilkat MailMan.Pop3Noop method, which sends a POP3 NOOP command to the server. NOOP does nothing except elicit a positive response, which is useful for keeping a session alive or verifying the connection is still responsive. This example begins a POP3 session and sends a NOOP.

Background: NOOP ("no operation") is a standard keep-alive across many internet protocols. Servers often drop idle connections after a timeout; sending a periodic NOOP resets that timer so a long-running session stays open. It also serves as a cheap "are you still there?" probe — a successful reply confirms the socket and the authenticated session are still healthy.

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import com.chilkatsoft.chilkat2.ChilkatException;
import com.chilkatsoft.chilkat2.MailMan;

public class ChilkatExample {

    public static void main(String[] args) {
        // Demonstrates the MailMan.Pop3Noop method, which sends a POP3 NOOP command to the server.
        // NOOP does nothing except elicit a positive response, which is useful for keeping a
        // session alive or verifying the connection is still responsive.

        MailMan mailman = new MailMan();

        // Configure the POP3 server connection.
        mailman.setMailHost("pop.example.com");
        mailman.setMailPort(995);
        mailman.setPopSsl(true);
        mailman.setPopUsername("user@example.com");
        mailman.setPopPassword("myPassword");

        // Begin a POP3 session.

        try {
            mailman.pop3BeginSession();

            // Send a NOOP to keep the session alive.
            mailman.pop3Noop();
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        System.out.println("POP3 NOOP succeeded.");
    }
}