Ruby

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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Ruby

require 'chilkat'

success = false

#  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.

email = Chilkat::CkEmail.new()

success = email.LoadEml("qa_data/eml/dsn_bounce.eml")
if (success == false)
    print email.lastErrorText() + "\n";
    exit
end

#  Read individual fields from the message/delivery-status part.
print "Action: " + email.getDeliveryStatusInfo("Action") + "\n";
print "Status: " + email.getDeliveryStatusInfo("Status") + "\n";
print "Final-Recipient: " + email.getDeliveryStatusInfo("Final-Recipient") + "\n";

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