Swift

Create DSN (Delivery Status Notification) Email

See more Email Object Examples

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

func chilkatTest() {
    var success: Bool = false

    let email = CkoEmail()!

    email.subject = "Test"
    email.from = "joe@example.com"
    email.body = "This is a test"
    email.add(to: "", emailAddress: "recipient@example.com")

    print("\(email.getMime()!)")
    print("")
    print("-------------------------------------------------------------")
    print("")

    // This is the email we just created:

    // MIME-Version: 1.0
    // Date: Mon, 12 May 2025 11:13:15 -0500
    // Message-ID: <917FA49F75544EF51948B0A52F403B925B51073F@SLICE>
    // Content-Type: text/plain; charset=us-ascii; format=flowed
    // Content-Transfer-Encoding: 7bit
    // X-Priority: 3 (Normal)
    // Subject: Test
    // From: joe@example.com
    // To: recipient@example.com
    // 
    // This is a test

    // -----------------------------------------------------------------
    // Convert the above email into a DSN (Delivery Status Notification)

    let xml = CkoXml()!
    xml.tag = "DeliveryStatusFields"
    xml.newChild2(tagPath: "Final-Recipient", content: "rfc822; recipient@example.com")
    xml.newChild2(tagPath: "Action", content: "failed")
    xml.newChild2(tagPath: "Status", content: "5.1.2")
    xml.newChild2(tagPath: "Diagnostic-Code", content: "smtp; 550 5.1.2 Host unknown (Domain name not found)")
    let dtNow = CkoDateTime()!
    dtNow.setFromCurrentSystemTime()
    xml.newChild2(tagPath: "Last-Attempt-Date", content: dtNow.get(asRfc822: true))

    var headerOnly: Bool = true
    let sbText = CkoStringBuilder()!
    sbText.append(value: "This is an automatically generated Delivery Status Notification.\r\n\r\n")
    sbText.append(value: "Delivery to the following recipient failed permanently:\r\n\r\n")
    sbText.append(value: "    recipient@example.com\r\n\r\n")
    sbText.append(value: "Technical details of permanent failure:\r\n")
    sbText.append(value: "DNS Error: Domain name not found\r\n")

    var explain: String? = sbText.getAsString()

    let dsnEmail = CkoEmail()!
    success = email.toDsn(explanation: explain, statusFields: xml.getXml(), headerOnly: headerOnly, dsnEmail: dsnEmail)
    if success == false {
        print("\(email.lastErrorText!)")
        return
    }

    print("\(dsnEmail.getMime()!)")

    // Here's the MIME of the DNS email we just created:
    // -------------------------------------------------

    // Content-Type: multipart/report; report-type="delivery-status"; boundary="------------060100020300020303000802"
    // 
    // --------------060100020300020303000802
    // Content-Type: text/plain; charset=windows-1252; format=flowed
    // Content-Transfer-Encoding: 7bit
    // 
    // This is an automatically generated Delivery Status Notification.
    // 
    // Delivery to the following recipient failed permanently:
    // 
    //     recipient@example.com
    // 
    // Technical details of permanent failure:
    // DNS Error: Domain name not found
    // 
    // --------------060100020300020303000802
    // Content-Type: message/delivery-status
    // 
    // Final-Recipient: rfc822; recipient@example.com
    // Action: failed
    // Status: 5.1.2
    // Diagnostic-Code: smtp; 550 5.1.2 Host unknown (Domain name not found)
    // Last-Attempt-Date: Mon, 12 May 2025 11:30:39 -0500
    // 
    // --------------060100020300020303000802
    // Content-Type: text/rfc822-headers; charset=windows-1252
    // 
    // MIME-Version: 1.0
    // Date: Mon, 12 May 2025 11:30:39 -0500
    // Message-ID: <B8E6875D582A78AE779FC0B46ACC8C858CEAF608@SLICE>
    // Content-Type: text/plain; charset=us-ascii; format=flowed
    // Content-Transfer-Encoding: 7bit
    // X-Priority: 3 (Normal)
    // Subject: Test
    // From: joe@example.com
    // To: recipient@example.com
    // --------------060100020300020303000802--

}