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Objective-C

Create DSN (Delivery Status Notification) Email

Demonstrates how to create a DSN (Delivery Status Notification) Email having the format as defined in RFC 3464.

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Objective-C 
#import <CkoEmail.h>
#import <CkoXml.h>
#import <NSString.h>

BOOL success = NO;

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

//  A DSN email is a report about the attempt to delivery 
//  an email.  It is usually a report that indicates failure or
//  or a delay in delivery.  The DSN is typically sent back to
//  the sender of an email.

//  IMPORTANT:
//  Note: Please be careful in sending automated DSN's.
//  It is important to be aware of an issue called "backscatter".
//  See the Wikipedia article here:  http://en.wikipedia.org/wiki/Backscatter_%28e-mail%29

//  The ToDsn method will be called to create a new
//  DSN email based upon the email object calling ToDsn.
//  The email object instance used to call ToDsn would
//  typically be an email received from a POP3 or IMAP server.
//  In this case, to simplify the example, we'll load the email
//  from a .eml file.

//  This example will be creating a DSN for "someEmail.eml"
success = [email LoadEml: @"someEmail.eml"];
if (success == NO) {
    NSLog(@"%@",email.LastErrorText);
    return true;
}

//  The DSN created by ToDsn will contain a 
//  "message/delivery-status" MIME sub-part that will
//  be composed of a number of name-value pairs.
//  See RFC 3464 ( http://tools.ietf.org/html/rfc3464 )
//  The name-value content for this part is passed
//  as XML to ToDsn. This part of the example
//  prepares the XML:
CkoXml *xml = [[CkoXml alloc] init];

//  For this example, we're just adding a few name-value pairs.
//  These should not be considered to be correct, required or
//  even sensible -- it's simply for the example.  
xml.Tag = @"DeliveryStatusFields";
[xml NewChild2: @"Status" content: @"5.1.2 (bad destination system: no such domain)"];
[xml NewChild2: @"Diagnostic-Code" content: @"smtp; Permanent failure: no such domain"];
[xml NewChild2: @"X-BounceCategory" content: @"bad-domain"];

NSString *xmlStr = [xml GetXml];

//  The last argument to be passed to ToDsn will be a boolean
//  indicating whether to include the entire MIME of the calling
//  email object in the DSN, or only the header.
//  It may make sense to include the entire email for small emails,
//  but for large emails (with large attachments) it's probably
//  best to make the DSN header-only.
BOOL bHeaderOnly = YES;

//  The first argument to be passed to ToDsn will
//  be a human-readable explanation that will be placed
//  into the 1st MIME part of the DSN (see RFC 3464).
NSString *humanReadableExplanation = @"Blah blah blah. The delivery of this email failed. Blah blah blah";

//  OK, we're ready to create DSN....
CkoEmail *dsnEmail = [[CkoEmail alloc] init];

success = [email ToDsn: humanReadableExplanation statusFields: xmlStr headerOnly: bHeaderOnly dsnEmail: dsnEmail];
if (success == NO) {
    NSLog(@"%@",email.LastErrorText);
    return true;
}

//  Show the MIME of the source (original) email:
NSLog(@"%@",[email GetMime]);

NSLog(@"%@",@"**************************************");

//  Show the MIME of the DSN email:
NSLog(@"%@",[dsnEmail GetMime]);

//  Sample output showing the MIME of the original email,
//  and the DSN email created based upon it:

//  X-Account-Key: account2
//  X-UIDL: 0D154945439D42BD80F180F6D9DE4D82
//  Received: with MailEnable Postoffice Connector;
//  	 Tue, 21 Jun 2011 09:21:23 -0400
//  Received: from qmta14.emeryville.ca.mail.comcast.net ([76.96.227.212]) by chilkatsoft.com with MailEnable ESMTP;
//  	 Tue, 21 Jun 2011 09:21:22 -0400
//  Received: from omta03.emeryville.ca.mail.comcast.net ([76.196.30.27]) by qmta14.emeryville.ca.mail.comcast.net with comcast id yd4k1g0050b6N64AEdLW9x;
//  	 Tue, 21 Jun 2011 13:20:30 +0000
//  Received: from [127.0.0.1] ([67.175.202.103]) by omta03.emeryville.ca.mail.comcast.net with comcast id ydLV1g00n2EMkZ78PdLWxi;
//  	 Tue, 21 Jun 2011 13:20:31 +0000
//  Message-ID: <4E009AA4.3090205@chilkatsoft.com>
//  Date: Tue, 21 Jun 2011 08:20:36 -0500
//  From: Chilkat Software <admin@chilkatsoft.com>
//  User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.2.17) Gecko/20110414 Thunderbird/3.1.10
//  MIME-Version: 1.0
//  To: Chilkat Support <support@chilkatsoft.com>
//  Subject: test 123
//  Content-Type: text/plain; charset=ISO-8859-1; format=flowed
//  Content-Transfer-Encoding: 7bit
//  Return-Path: <>
//  X-Antivirus: avast! (VPS 110621-0, 06/21/2011), Inbound message
//  X-Antivirus-Status: Clean
//  
//  This is a test 123
//  
//  
//  
//  **************************************
//  Content-Type: multipart/report; report-type=delivery-status;
//  	 boundary="------------070202040604030701060106"
//  
//  --------------070202040604030701060106
//  Content-Type: text/plain
//  Content-Transfer-Encoding: 7bit
//  
//  Blah blah blah. The delivery of this email failed. Blah blah blah
//  --------------070202040604030701060106
//  Content-Type: message/delivery-status
//  
//  Status: 5.1.2 (bad destination system: no such domain)
//  Diagnostic-Code: smtp; Permanent failure: no such domain
//  X-BounceCategory: bad-domain
//  
//  --------------070202040604030701060106
//  Content-Type: text/rfc822-headers
//  
//  X-Account-Key: account2
//  X-UIDL: 0D154945439D42BD80F180F6D9DE4D82
//  Received: with MailEnable Postoffice Connector;
//  	 Tue, 21 Jun 2011 09:21:23 -0400
//  Received: from qmta14.emeryville.ca.mail.comcast.net ([76.96.227.212]) by chilkatsoft.com with MailEnable ESMTP;
//  	 Tue, 21 Jun 2011 09:21:22 -0400
//  Received: from omta03.emeryville.ca.mail.comcast.net ([76.196.30.27]) by qmta14.emeryville.ca.mail.comcast.net with comcast id yd4k1g0050b6N64AEdLW9x;
//  	 Tue, 21 Jun 2011 13:20:30 +0000
//  Received: from [127.0.0.1] ([67.175.202.103]) by omta03.emeryville.ca.mail.comcast.net with comcast id ydLV1g00n2EMkZ78PdLWxi;
//  	 Tue, 21 Jun 2011 13:20:31 +0000
//  Message-ID: <4E009AA4.3090205@chilkatsoft.com>
//  Date: Tue, 21 Jun 2011 08:20:36 -0500
//  From: Chilkat Software <admin@chilkatsoft.com>
//  User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.2.17) Gecko/20110414 Thunderbird/3.1.10
//  MIME-Version: 1.0
//  To: Chilkat Support <support@chilkatsoft.com>
//  Subject: test 123
//  Content-Type: text/plain; charset=ISO-8859-1; format=flowed
//  Content-Transfer-Encoding: 7bit
//  Return-Path: <>
//  X-Antivirus: avast! (VPS 110621-0, 06/21/2011), Inbound message
//  X-Antivirus-Status: Clean
//  --------------070202040604030701060106--
//  
//