Ryan,
this has nothing to do with the quality of the email addresses going to 
Yahoo.  (I have some large lists and get this all the time from yahoo).

The error you are getting is a 421 error, not a 5xx series error.  400 
series errors are temporary failures and should be retried.  500 series 
errors are fatal errors and should not be retried.

But in this case, it's a 421, so a retry is in order.

Yahoo plays by it's own rules and there doesn't seem to be much anyone 
can do about it and it's almost impossible to contact an intelligent 
human there.

To mitigate this problem, I use g_send_tolimit to limit yahoo sends to 
300 per hour and that helps.

Lyle Giese
LCR Computer Services, Inc.


On 07/24/11 22:49, SurgeMail Support wrote:
> If using dlist then set for each list:
>
> bounce_remove "true"
>
> To automatically remove the failures...
>
> Regards,
> Stuart
>
> On 22/07/2011 10:22 p.m., surgemailHIDDEN@etwinsite.com wrote:
>> Hi All ... hoping someone can help me out ...
>>
>> Recently my email server has been receiving the following error when
>> sending to Yahoo:
>>
>> 421 4.7.0 [TS01] Messages from 202.70.128.4 temporarily deferred due
>> to user complaints - 4.16.55.1; see
>> http://postmaster.yahoo.com/421-ts01.html
>>
>> I went to the referred site and completed their first form, upon which
>> I received an email referring me to read:
>>
>> http://help.yahoo.com/l/us/yahoo/mail/postmaster/basics/postmaster-15.html
>>
>>
>>
>> Within this page Yahoo requests ...
>>
>> Don't retry 5xx messages. If we reject a message with a 5xx error, we
>> will not accept it anytime soon. Retrying the message wastes both our
>> resources and makes you appear to have a dirty list.
>>
>>
>> How do I config surgemail to not send retry when receiving a 5xx error???
>>
>>
>> My user base is such that they are lazy and IT incompetent - being
>> that they dont check email addresses, they dont care for bounce back
>> messages, and they simply dont get it. Consequently, my email server
>> queue is full of 550 bounce backs which explains the damaged
>> reputation of my email server.
>>
>>
>> Any advice would be really appreciated.
>>
>> -Ryan-
>
>