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)
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