Objective-C

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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Objective-C

#import <CkoEmail.h>

BOOL success = NO;

//  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.

CkoEmail *email = [[CkoEmail alloc] init];

success = [email LoadEml: @"qa_data/eml/dsn_bounce.eml"];
if (success == NO) {
    NSLog(@"%@",email.LastErrorText);
    return true;
}

//  Read individual fields from the message/delivery-status part.
NSLog(@"%@%@",@"Action: ",[email GetDeliveryStatusInfo: @"Action"]);
NSLog(@"%@%@",@"Status: ",[email GetDeliveryStatusInfo: @"Status"]);
NSLog(@"%@%@",@"Final-Recipient: ",[email GetDeliveryStatusInfo: @"Final-Recipient"]);

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