[Mailman-Users] Yahoo rejects

The Mailing List Server Admin List.Server.Admin at unh.edu
Mon Mar 19 08:30:15 EDT 2018

Hello -

FWIW, I've seen this recently from Yahoo as well, and have been unable to 
get a reponse from Yahoo about it.

It seems very likely that, as Grant Taylor suggests, its a filtering 
issue. It's been an occasional recommendation here for users of high 
priority lists to use a mail provider other than Yahoo, for more or less 
this reason. Our guess is that if a user or users report mailing list 
messages as spam, instead of unsubscribing, Yahoo's filter may begin 
mistreating list  messages from a given source as spam for a time - 
usually a week or two.

Yahoo's lack of outbound communication, and the 5xy rejection code for an 
active user make unravelling this more of a challenge than it need be.


      You recently wrote to the UNH Mailing List Server Admin:

> On 03/16/2018 01:57 PM, Jim Dory wrote:
>> ---------- Forwarded message ----------
>> From: MAILER-DAEMON at domain2.example
>> To: nome-announce-bounces at domain1.example
>> Cc:
>> Bcc:
>> Date:
>> Subject: Delivery failure
>> Message from domain2.example.
>> Unable to deliver message to the following address(es).
>> <redacted1 at domain2.example <redacted2 at domain2.example>>:
>> This user doesn't have a domain2.example account (redacted1 at domain2.example
>> <redacted2 at domain2.example>) [0]
> Okay.  That seems like a generic "non existent user" type response.
>> (I've snipped the address)
> ;-)
>> I got this delivery failure on perhaps 30 yahoo users over the last couple
>> days, and it is repeating. When I write to any of the users personally,
>> they respond that - yes, they are still there.
> Okay.  So Yahoo is returning 5xy errors that make it seem like the recipient 
> address is invalid for known good recipient addresses.
> It sounds like some sort of filtering is either mis-behaving or poorly 
> configured to me.
> Has there been any noise about Yahoo on mailop about this new behavior?
> -- 
> Grant. . . .
> unix || die

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