Speaking a someone who runs a listserver, (well actually, Sympa), and 
deals with this kind of garbage all the time.  It occurs to me that TWO 
different things are going on:

- the CODE4LIB list, or the CLIR.ORG listserver, or both are tuned to 
drop people rather quickly - perhaps that should be backed off a bit, 
with an automatic warning before an address is dropped

- looks like the listserver, and/or some members, need to update 
conditions that cause some sites (e.g., google.com) to bounce mail

Both are issues for the list/server admin to deal with.

Miles Fidelman


On 9/15/16 10:20 AM, Robert Sandusky wrote:
> This has happened to me a couple of times over the past ~2 years. I'm 
> on a *nix based mail system operated by campus IT, not gmail.
>
> Bob
>
> On 9/15/2016 9:16 AM, Eric Hellman wrote:
>> Have others been having difficulty staying subscribed? It seems gmail 
>> doesn't like the CLIR listserv.
>>
>>> - The first error was reported on 2016-09-09.
>>>
>>> - Since then, a total of 10 delivery errors have been received.
>>>
>>> - The last reported error was: 5.7.1 550-5.7.1
>>> [2600:3c03::f03c:91ff:fe55:a961]  Our  system   has  detected that  
>>> this
>>> 550-5.7.1 message  does not  meet IPv6  sending guidelines regarding 
>>> PTR
>>> records   550-5.7.1   and   authentication.   Please review   550-5.7.1
>>> https://support.google.com/mail/?p=IPv6AuthError 
>>> <https://support.google.com/mail/?p=IPv6AuthError> for more 
>>> information 550
>>> 5.7.1 . g16... (23 bytes suppressed)
>>
>>
>> Eric Hellman
>> President, Free Ebook Foundation
>> Founder, Unglue.it <http://unglue.it/> https://unglue.it/ 
>> <https://unglue.it/>
>> https://go-to-hellman.blogspot.com/ 
>> <https://go-to-hellman.blogspot.com/>
>> twitter: @gluejar
>>

-- 
In theory, there is no difference between theory and practice.
In practice, there is.  .... Yogi Berra