I am the list owner for the list [log in to unmask] (hosted by Penn State) which has 324 subscribers that include mainly yahoo, hotmail, aol, comcast, msn, gmail, psu.edu, and verizon.net addresses, and 10-15 others. On 4/10 listserv sent me an error file with 79 error messages, some of which said "Message rejected due to DMARC" and others said "could not be delivered due to domain owner policy restrictions", but that was just that day. Listserv didn't delete or bounce any subscribers to that list. No subscribers have reported any problems. I have checked for announcements from Penn State about this problem but haven't seen any.

Bob Fowles
list owner for list [log in to unmask]

On Apr 14, 2014, at 10:40 AM, Chris Barnes <[log in to unmask]> wrote:

> I recently started getting bounces on my lists for ALL of my subscribers who use Yahoo.com as their email provider:
>    Last error: 5.7.9 554 5.7.9 Message not accepted for policy
>      reasons. See 
> http://postmaster.yahoo.com/errors/postmaster-28.html
> 
> When I asked my local Listserv postmaster about this, they sent me back the reply appended to the bottom.   My question is:   is EVERYONE who owns Listserv lists having this problem?
> 
> --- 
> 
> Howdy, 
> 
> On April 8 Yahoo implemented a new policy that blocks messages from lists not hosted by Yahoo or Google. The idea is to only allow messages which comply to a certain security standard to prevent phishing scams and other forms of email abuse. The immediate problem with this policy is that all universities running Listserv are affected and there is little we can do about it. Note that all domains hosted by Yahoo are affected which includes email addresses from ISP's such as Comcast and AT&T. 
> 
> The only current solution is to unsubscribe @yahoo addresses from your lists and send them an email explaining why they are being removed and prompt them to subscribe with an alternative email address. While this is not ideal, this is going to be the solution unless Yahoo rolls back this decision. 
> 
> I hope that clears up the confusion over what is happening. If you have any more questions please let us know as we are always glad to help. Have a great day! 
> 
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