AOL "mailbox full" bounces vs. ezmlm-return

I was browsing through my qmail logs and saw inbound messages that 
looked like AOL bouncing messages from an ezmlm-idx list.  For some 
reason, it didn't look like they were being processed by the 
ezmlm-return bounce handler.  I sent a test message to the address in 
question, and got back a "mailbox full" bounce which is presumably 
the same kind of message that was being sent to the list-return 
address.  The bounce is included below.  I read the ezmlm-weed man 
page to see if it could be weeding out these bounces, and it's not 
really clear.  The part that confuses me says

        Delivery-status  notification  (DSN,  rfc1891).  All  DSN messages with
        ``Action'' other than ``failed'':

           Content-type: multipart/report



The bounce does have a Content-type: multipart/report header, but it 
also contains
Action: failed

 From the format of man ezmlm-weed, it's not clear whether it thinks 
Content-type: multipart/report means  ``Action'' other than ``failed''

Has anybody else noticed what their ezmlm-idx is doing with AOL 
"mailbox full" messages?  I'm running ezmlm-idx-5.1.0.  Is it 
intentional that "mailbox full" messages are not treated like other 
bounces?  I've seen debates on other lists about whether the 
receiving server should return a temporary 4xx error or a permanent 
5xx one for a full mailbox, since it might be only full temporarily. 
But it looks like AOL has decided it deserves a permanent error, so 
shouldn't ezmlm-idx treat it as a permanent error?

Bounce message follows:

Received: from rly-xa06.mx.aol.com (rly-xa06.mail.aol.com [172.20.64.42])
	by omr-d03.mail.aol.com (8.13.6/8.13.6) with ESMTP id kBAFeU6E021862
	for <[email protected]>; Sun, 10 Dec 2006 10:40:30 -0500
Received: from localhost (localhost)
	  by rly-xa06.mx.aol.com (8.8.8/8.8.8/AOL-5.0.0)
	  with internal id KAA01957;
	  Sun, 10 Dec 2006 10:40:30 -0500 (EST)
Date: Sun, 10 Dec 2006 10:40:30 -0500 (EST)
From: Mail Delivery Subsystem <[email protected]>
Message-Id: <[email protected]>
To: <[email protected]>
MIME-Version: 1.0
Content-Type: multipart/report; report-type=delivery-status;
	boundary="KAA01957.1165765230/rly-xa06.mx.aol.com"
Subject: Returned mail: Service unavailable
Auto-Submitted: auto-generated (failure)
X-AOL-INRLY: crossbo.jmatt.net [208.116.11.36] rly-xa06



The original message was received at Sun, 10 Dec 2006 10:40:10 -0500 (EST)
from crossbo.jmatt.net [208.116.11.36]


*** ATTENTION ***

Your e-mail is being returned to you because there was a problem with its
delivery.  The address which was undeliverable is listed in the section
labeled: "----- The following addresses had permanent fatal errors -----".

The reason your mail is being returned to you is listed in the section
labeled: "----- Transcript of Session Follows -----".

The line beginning with "<<<" describes the specific reason your e-mail could
not be delivered.  The next line contains a second error message which is a
general translation for other e-mail servers.

Please direct further questions regarding this message to your e-mail
administrator.

--AOL Postmaster



    ----- The following addresses had permanent fatal errors -----
<[email protected]>

    ----- Transcript of session follows -----
... while talking to air-xa04.mail.aol.com.:
>>>  RCPT To:<[email protected]>
<<< 552 somebody MAILBOX FULL
554 <[email protected]>... Service unavailable

Reporting-MTA: dns; rly-xa06.mx.aol.com
Arrival-Date: Sun, 10 Dec 2006 10:40:10 -0500 (EST)

Final-Recipient: RFC822; [email protected]
Action: failed
Status: 5.5.0
Remote-MTA: DNS; air-xa04.mail.aol.com
Diagnostic-Code: SMTP; 552 somebody MAILBOX FULL
Last-Attempt-Date: Sun, 10 Dec 2006 10:40:30 -0500 (EST)

Received: from  foxhunters.org (crossbo.jmatt.net [208.116.11.36]) by 
rly-xa06.mx.aol.com (v114.2) with ESMTP id 
MAILRELAYINXA67-6bd457c29c129a; Sun, 10 Dec 2006 10:38:45 -0500
From: [email protected]
Date: Sun, 10 Dec 2006 08:39:50 -0500
Subject: Test - disregard
X-AOL-IP: 208.116.11.36
X-AOL-SCOLL-SCORE: 0:2:469805702:13421772
X-AOL-SCOLL-URL_COUNT: 0
Message-ID: <[email protected]>