On Tue, Apr 24, 2018 at 08:35:17PM +0200,
 Fredrik Korsbäck <hu...@nordu.net> wrote 
 a message of 28 lines which said:

> Surprised this hasnt "made the news" over at this list yet.

It may be also because NANOG email is handled by Google, who broke its antispam:

<nanog@nanog.org>: host aspmx.l.google.com[2a00:1450:400c:c08::1a] said:
    550-5.7.1 This message does not have authentication information or
    fails to
        pass 550-5.7.1 authentication checks. To best protect our
        users from spam,
            the 550-5.7.1 message has been blocked. Please visit
            550-5.7.1
                https://support.google.com/mail/answer/81126#authentication
                for more 550
                    5.7.1 information. v20-v6si12240130wrb.82 - gsmtp
                    (in reply to end of DATA
                        command)

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