Great Circle Associates List-Managers
(January 2000)

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Subject: not compliant with RFC 1893
From: Olivier Salaun - CRU <Olivier . Salaun @ cru . fr>
Date: Thu, 06 Jan 2000 15:58:50 +0100
To: list-managers @ GreatCircle . COM
Cc: postmaster @ aol . com


We are developing a non-delivery reports analyzer for Sympa MLM.
This module already extracts bouncing address and error status for more 
than 90% of "bounces". The goal is to provide information about
bouncing addresses within a web interface (WWSympa) for list-owners.

Analysis is mainly based on RFCs 1891-1894 defining a MIME extension
for Delivery Status Notifications, allowing (automatic) identification
of recipients and error status.

RFC 1893 defines Mail System Status Codes to be used by MTAs.
Eg: 5.1.1 => User unknown ; 5.2.2 => Mailbox full

I found out that is not compatible with status codes as 
defined in RFC 1893. As you can see in the sample bellow, the 
transcript of session indicates a 'User Unkown' whereas "Status" 
field of the delivery-status indicates a Success (2.0.0). This 
completely alter the analysis of error reports !

Did anyone already observe such problems with other ISPs ?

Olivier SalaŁn

Here is a sample Delivery Status Notification :

 	Content-Type: multipart/report; report-type=delivery-status;


   	----- Transcript of session follows -----
	... while talking to
	>>> RCPT To:
	550 ... User unknown

	Content-Type: message/delivery-status

	Reporting-MTA: dns;
	Arrival-Date: Thu, 6 Jan 2000 09:22:43 +0100 (MET)

	Final-Recipient: rfc822;
	Action: failed
	Status: 2.0.0
	Diagnostic-Code: smtp; 250 OK

	Content-Type: text/rfc822-headers


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