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selesduab@gmail.com: host gmail-smtp-in.l.google.com[2607:f8b0:4023:1411::1b] said: 550-5.7.1 [2605:bc80:3010::133] 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 . Please review 550-5.7.1 https://support.google.com/mail/?p=IPv6AuthError for more information 550 5.7.1 . e138-20020a25d390000000b00da0cb844d87si767091ybf.87 - gsmtp (in reply to end of DATA command)