Lua

Count the Report Parts in a multipart/report Email

Demonstrates the read-only Chilkat Email.NumReports property, which is the number of report parts in a multipart/report email. A part is counted as a report when its Content-Type is message/* (except message/rfc822) or text/rfc822-headers. Use GetReport to retrieve the body of each report part; indexes are zero-based. This example loads a report email and prints each report part.

Background: When a message can't be delivered, the mail system usually sends back a bounce known as a Delivery Status Notification (DSN). DSNs use the multipart/report structure, which bundles several parts: a human-readable explanation, a machine-readable message/delivery-status part describing exactly what happened (recipient, status code, failing server), and often the original message's headers. Reading these report parts lets a program automatically detect and process bounces.

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Lua

local chilkat = require("chilkat")

-- Demonstrates the read-only Email.NumReports property, which is the number of report
-- parts in a multipart/report email (for example, a Delivery Status Notification).
-- Use GetReport to retrieve the body of each report part.  Indexes are zero-based.

local email = chilkat.Email.new()

-- Load a multipart/report email (such as a bounce / DSN message).
local success = email:load_eml("qa_data/eml/dsn_bounce.eml")
if not success then
    print(email.last_error_text)
    return
end

local n = email.num_reports
print("NumReports = " .. n)

for i = 0, n - 1 do
    print("---- Report " .. i .. " ----")
    print(email:get_report(i))
end