Lua

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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Lua

local chilkat = require("chilkat")

-- 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.

local mailman = chilkat.MailMan.new()

-- Configure the POP3 server connection.
mailman.mail_host = "pop.example.com"
mailman.mail_port = 995
mailman.pop_ssl = true
mailman.pop_username = "user@example.com"
mailman.pop_password = "myPassword"

-- Begin a POP3 session.

local success = mailman:pop3_begin_session()
if not success then
    print(mailman.last_error_text)
    return
end

-- Send a NOOP to keep the session alive.
success = mailman:pop3_noop()
if not success then
    print(mailman.last_error_text)
    return
end

print("POP3 NOOP succeeded.")