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