(Swift 3,4,5...) 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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func chilkatTest() {
    let email = CkoEmail()!

    var success: Bool

    // 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 CreateDsn method will be called to create a new
    // DSN email based upon the email object calling CreateDsn.
    // The email object instance used to call CreateDsn 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 != true {
        print("\(email.lastErrorText!)")
        return
    }

    // The DSN created by CreateDsn 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 CreateDsn. This part of the example
    // prepares the XML:
    let xml = CkoXml()!

    // 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")

    var xmlStr: String? = xml.getXml()

    // The last argument to be passed to CreateDsn 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.
    var bHeaderOnly: Bool = true

    // The first argument to be passed to CreateDsn will
    // be a human-readable explanation that will be placed
    // into the 1st MIME part of the DSN (see RFC 3464).
    var humanReadableExplanation: String? = "Blah blah blah. The delivery of this email failed. Blah blah blah"

    // OK, we're ready to create DSN....
    var dsnEmail: CkoEmail?

    dsnEmail = email.createDsn(humanReadableExplanation, xmlDeliveryStatus: xmlStr, bHeaderOnly: bHeaderOnly)
    if email.lastMethodSuccess == false {
        print("\(email.lastErrorText!)")
        return
    }

    // Show the MIME of the source (original) email:
    print("\(email.getMime()!)")

    print("**************************************")

    // Show the MIME of the DSN email:
    print("\(dsnEmail!.getMime()!)")

    dsnEmail = nil

    // 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--
    // 
    // 

}