Dart Requires Chilkat v11.0.0+
Dart
Create DSN (Delivery Status Notification) Email
Demonstrates how to create a DSN (Delivery Status Notification) Email having the format as defined in RFC 3464.Chilkat Dart Downloads
import 'package:chilkat/chilkat.dart';
void main() {
final email = CkEmail();
// 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"
try {
email.loadEml('someEmail.eml');
} on ChilkatException catch (e) {
print(e.lastErrorText);
return;
}
// 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:
final xml = CkXml();
// 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', '5.1.2 (bad destination system: no such domain)');
xml.newChild2('Diagnostic-Code', 'smtp; Permanent failure: no such domain');
xml.newChild2('X-BounceCategory', 'bad-domain');
final 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.
final bHeaderOnly = true;
// 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).
final humanReadableExplanation = 'Blah blah blah. The delivery of this email failed. Blah blah blah';
// OK, we're ready to create DSN....
final dsnEmail = CkEmail();
try {
email.toDsn(humanReadableExplanation, xmlStr, bHeaderOnly, dsnEmail);
} on ChilkatException catch (e) {
print(e.lastErrorText);
return;
}
// Show the MIME of the source (original) email:
print(email.getMime());
print('**************************************');
// Show the MIME of the DSN email:
print(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--
//
//
}