Lua

Read Delivery-Status Fields from a Bounce

Demonstrates the Chilkat Email.GetDeliveryStatusInfo method, which returns a named field from the message/delivery-status part of a delivery-status notification (DSN). It should be called only for an email identified as a delivery-status notification. This example loads a bounce message and reads its Action, Status, and Final-Recipient fields.

Background: When a message can't be delivered, the mail system returns a bounce as a multipart/report whose message/delivery-status part carries machine-readable fields: Action (e.g. failed), Status (a numeric code like 5.1.1 meaning "no such mailbox"), and Final-Recipient (the address that failed). Parsing these lets a program automatically detect hard bounces and prune bad addresses from a mailing list.

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Lua

local chilkat = require("chilkat")

-- Demonstrates the GetDeliveryStatusInfo method, which returns a field from the
-- message/delivery-status part of a delivery-status notification (DSN / bounce).
-- Call it only for an email that is a delivery-status notification.

local email = chilkat.Email.new()

local success = email:load_eml("qa_data/eml/dsn_bounce.eml")
if not success then
    print(email.last_error_text)
    return
end

-- Read individual fields from the message/delivery-status part.
print("Action: " .. email:get_delivery_status_info("Action"))
print("Status: " .. email:get_delivery_status_info("Status"))
print("Final-Recipient: " .. email:get_delivery_status_info("Final-Recipient"))

-- Note: The path "qa_data/..." is a relative local filesystem path,
-- relative to the current working directory of the running application.