hi, i am trying to install mail server. The first server is working as expected. But the second one, it's not working and got this error:
Jan 8 16:08:53 en-cvm-3jvayqs23i223 postfix/smtp[3735]: 04B541823C81: to=<xxxxx@gmail.com>, relay=gmail-smtp-in.l.google.com[2404:6800:4008:c07::1b]:25, delay=1.9, delays=0.31/0.02/1.1/0.5, dsn=5.7.1, status=bounced (host gmail-smtp-in.l.google.com[2404:6800:4008:c07::1b] said: 550-5.7.1 [] Our system has detected that this message does 550-5.7.1 not meet IPv6 sending guidelines regarding PTR records and 550-5.7.1 authentication. Please review 550-5.7.1 https://support.google.com/mail/?p=IPv6AuthError for more information 550 5.7.1 . d9-20020a170902cec900b001926061d39fsi7347420plg.581 - gsmtp (in reply to end of DATA command))
Jan 8 16:08:53 en-cvm-3jvayqs23i223 postfix/cleanup[3733]: E29DA1823C92: message-id=<20230108160853.E29DA1823C92@en-cvm-3jvayqs23i223.novalocal>
Jan 8 16:08:53 en-cvm-3jvayqs23i223 postfix/bounce[3737]: 04B541823C81: sender non-delivery notification: E29DA1823C92
Jan 8 16:08:53 en-cvm-3jvayqs23i223 postfix/qmgr[3695]: E29DA1823C92: from=<>, size=3611, nrcpt=1 (queue active)
Jan 8 16:08:53 en-cvm-3jvayqs23i223 postfix/qmgr[3695]: 04B541823C81: removed
any suggestion?
