Lua

Download the Full Version of a Partial Email

Demonstrates the Chilkat MailMan.FetchFull method, which downloads the complete version of a header-only or partial Email and stores it in a second Email. The full result includes the complete body and any attachments, and the partial email must retain its UIDL. This example previews message 1 (headers only) and then downloads it in full.

Background: A common pattern is to download headers first — cheap and fast — show the user a message list, and only pull the full content when a message is actually opened. FetchFull completes that "download on demand" flow: given a partial email (which carries its UIDL), it fetches the rest from the server. This keeps bandwidth and latency low when browsing a large mailbox.

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Lua

local chilkat = require("chilkat")

-- Demonstrates the MailMan.FetchFull method, which downloads the complete version of a
-- header-only or partial Email and stores it in a second Email.  The full result includes
-- the complete body and any attachments.  The partial email must retain its UIDL.

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"

-- First fetch message 1 as headers only (a fast preview).  headerOnly=true.
local partialEmail = chilkat.Email.new()

local success = mailman:fetch_one(true, 0, 1, partialEmail)
if not success then
    print(mailman.last_error_text)
    return
end

print("Preview subject: " .. partialEmail.subject)

-- Now download the complete message (body and attachments).
local fullEmail = chilkat.Email.new()
success = mailman:fetch_full(partialEmail, fullEmail)
if not success then
    print(mailman.last_error_text)
    return
end

print("Full email NumAttachments: " .. fullEmail.num_attachments)

-- Note: Explicitly connecting/authenticating is optional.  Chilkat MailMan automatically
-- connects and authenticates -- using the property settings above -- whenever a server
-- operation requires it.  Calling the explicit connect/authenticate methods can still be
-- helpful to determine whether a failure occurs while connecting or while authenticating.