Lua

Send a Raw SMTP Command

Demonstrates the Chilkat MailMan.SmtpSendRawCommand method, which sends a raw command to the SMTP server and returns the server's response. The second argument specifies the charset to use if the command contains non-US-ASCII characters, and the third indicates whether to base64-encode the command before sending. This example sends a raw NOOP on an open connection.

Background: SMTP is a line-based text protocol (EHLO, MAIL FROM, RCPT TO, DATA, QUIT), so a raw-command hook lets you issue anything Chilkat doesn't wrap — a server extension, or a custom step during a manual auth exchange. The base64 flag exists because some SMTP exchanges (notably AUTH challenge/response) require the argument to be base64-encoded on the wire.

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Lua

local chilkat = require("chilkat")

-- Demonstrates the MailMan.SmtpSendRawCommand method, which sends a raw command to the SMTP
-- server and returns the server's response.  The 2nd argument is the charset used if the
-- command contains non-US-ASCII characters, and the 3rd indicates whether to base64-encode
-- the command before sending.

local mailman = chilkat.MailMan.new()

-- Configure the SMTP server connection.
mailman.smtp_host = "smtp.example.com"
mailman.smtp_port = 465
mailman.smtp_ssl = true
mailman.smtp_username = "user@example.com"
mailman.smtp_password = "myPassword"

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

-- Send the raw SMTP NOOP command (not base64-encoded).
local response = mailman:smtp_send_raw_command("NOOP", "us-ascii", false)
if not mailman.last_method_success then
    print(mailman.last_error_text)
    return
end

print("NOOP response: " .. response)

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