CkPython Requires Chilkat v11.0.0+
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 CkPython Downloads

CkPython
import sys
import chilkat

success = False

email = chilkat.CkEmail()

email.put_Subject("Test")
email.put_From("joe@example.com")
email.put_Body("This is a test")
email.AddTo("","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)

xml = chilkat.CkXml()
xml.put_Tag("DeliveryStatusFields")
xml.NewChild2("Final-Recipient","rfc822; recipient@example.com")
xml.NewChild2("Action","failed")
xml.NewChild2("Status","5.1.2")
xml.NewChild2("Diagnostic-Code","smtp; 550 5.1.2 Host unknown (Domain name not found)")
dtNow = chilkat.CkDateTime()
dtNow.SetFromCurrentSystemTime()
xml.NewChild2("Last-Attempt-Date",dtNow.getAsRfc822(True))

headerOnly = True
sbText = chilkat.CkStringBuilder()
sbText.Append("This is an automatically generated Delivery Status Notification.\r\n\r\n")
sbText.Append("Delivery to the following recipient failed permanently:\r\n\r\n")
sbText.Append("    recipient@example.com\r\n\r\n")
sbText.Append("Technical details of permanent failure:\r\n")
sbText.Append("DNS Error: Domain name not found\r\n")

explain = sbText.getAsString()

dsnEmail = chilkat.CkEmail()
success = email.ToDsn(explain,xml.getXml(),headerOnly,dsnEmail)
if (success == False):
    print(email.lastErrorText())
    sys.exit()

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--