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bethgnieto@gmail.com: host gmail-smtp-in.l.google.com[2607:f8b0:400e:c06::1b] said: 550-5.7.1 [2605:bc80:3010::136] Gmail has detected that this message does not 550-5.7.1 meet IPv6 sending guidelines regarding PTR records and authentication 550-5.7.1 . For more information, go to 550 5.7.1 https://support.google.com/mail/?p=IPv6AuthError j22-20020a632316000000b005dc81eca355si9644076pgj.487 - gsmtp (in reply to end of DATA command)