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