Rust

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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Rust


// 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.

let mailman = chilkat::MailMan::new();

// Configure the POP3 server connection.
mailman.set_mail_host("pop.example.com");
mailman.set_mail_port(995);
mailman.set_pop_ssl(true);
mailman.set_pop_username("user@example.com");
mailman.set_pop_password("myPassword");

// Begin a POP3 session.

if mailman.pop3_begin_session().is_err() {
    println!("{}", mailman.last_error_text());
    return;
}

// Send a NOOP to keep the session alive.
if mailman.pop3_noop().is_err() {
    println!("{}", mailman.last_error_text());
    return;
}

println!("POP3 NOOP succeeded.");