Oct 14 07:25:51 imail postfix/smtp[630]: A525###651C: to=<######@gmail.com>, relay=gmail-smtp-in.l.google.com[2607:f8b0:400e:c01::1a]:25, delay=5.7, delays=0.13/0.02/1.3/4.2, dsn=5.7.1, status=bounced (host gmail-smtp-in.l.google.com[2607:f8b0:400e:c01::1a] said: 550-5.7.1 [2001:4420:xxx:xxx::xxx      16] 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=ipv6_authentication_error for more 550 5.7.1 information. a1si30721paf.121 - gsmtp (in reply to end of DATA command))

這是因為沒有設定ipv6的反解紀錄
記得,ipv6也是要設定PTR喔...

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