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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