Today the situation cleared on it’s own as it appears. (at least I haven’t been 
notified of any human action)

Thanks to all those replying on and off list.

Regards,

Marc

> On 11 Jan 2016, at 13:25, Marc Storck <[email protected]> wrote:
> 
> Hello,
> 
> I’m looking for a Yahoo email administrator who could contact me offlist.
> 
> I have a customer with a clean record that is getting thsi error:
> 
> Error: "421 4.7.1 [TS03] All messages from x.x.x.x permanently deferred" when 
> sending email to Yahoo
> 
> The customer is a local non-profit and sends a very limited amount of emails 
> to members, suppliers and other contacts. Mailing-lists are only used to 
> contact members of the NPO.
> 
> I checked the recommendation listed at
> https://help.yahoo.com/kb/postmaster/SLN3436.html
> 
> and checked his IP address on several “multi-rbl” lookup sites. All looks 
> clean.
> 
> So I need more input to understand what we need to correct.
> 
> Thank you very much in advance.
> 
> Best regards,
> 
> Marc
> 
> 

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