[Mailman-Users] Weird spate of AOL and Yahoo 'undeliverable' bounces

[Johnson, Bruce E - (bjohnson)]

We sent a message out to our alumni mailing list and got a whole bunch of 
bounces like this:

The attached message was received as a bounce, but either the bounce
format was not recognized, or no member addresses could be extracted
from it.  This mailing list has been configured to send all
unrecognized bounce messages to the list administrator(s).

For more information see:
https://xxx/mailman/admin/alumni/bounce


From: mailer-dae...@yahoo.com
Subject: Failure Notice
Date: March 16, 2023 at 1:57:17 PM MST
To: 
alumni-bounces@lxxx


I'm afraid I wasn't able to deliver the following message.
This is a permanent error; I've given up. Sorry it didn't work out.

Subject: [Alumni] REMINDER: Join Us | APhA Annual Meeting & Exposition
Alumni and Friends Reception

Complete with the weird background color

Strangely EACH and every one of them was a yahoo or AOL address (Yahoo now owns 
AOL)

Could they be bouncing this based on SPF, DMARC or DKIM issues and just not 
telling us?

--
Bruce Johnson
University of Arizona
College of Pharmacy
Information Technology Group

Institutions do not have opinions, merely customs

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[Mailman-Users] Re: Weird spate of AOL and Yahoo 'undeliverable' bounces

[Mark Sapiro]

On 3/16/23 16:31, Johnson, Bruce E - (bjohnson) wrote:

We sent a message out to our alumni mailing list and got a whole bunch of 
bounces like this:

The attached message was received as a bounce, but either the bounce
format was not recognized, or no member addresses could be extracted
from it.  This mailing list has been configured to send all
unrecognized bounce messages to the list administrator(s).

For more information see:
https://xxx/mailman/admin/alumni/bounce


From: mailer-dae...@yahoo.com
Subject: Failure Notice
Date: March 16, 2023 at 1:57:17 PM MST
To: 
alumni-bounces@lxxx


I'm afraid I wasn't able to deliver the following message.
This is a permanent error; I've given up. Sorry it didn't work out.



Interesting. Coincidently, earlier today I received a more or less 
identical Failure Notice for a message to an address @aol.com. According 
to my mail log, the message was accepted by mx-aol.mail.gm0.yahoodns.net 
and then subsequently the Failure Notice from aol was returned.


However, I just now tried sending to the same aol.com address and this 
time mx-aol.mail.gm0.yahoodns.net rejected the message with 552 1 
Requested mail action aborted, mailbox not found (in reply to end of 
DATA command)


--
Mark Sapiro The highway is for gamblers,
San Francisco Bay Area, Californiabetter use your sense - B. Dylan

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