CentOS release 6.7 (Final)
When i send mail from my server to gmail i have this error:
elivery 5746: failure: 2a00:1450:400c:c07::1a_failed_after_I_sent_the_message./Remote_host_said:550-5.7.1[2001:41d0:2:1e5f::]_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=ipv6_authentication_error_for_more/550_5.7.1_information.q3si21483847wmb.104-_gsmtp/
send to others email’s all perfect.
How i can fix that?
The method to correct this error depends upon if you are using IPv6 or not
If you use IPv6, you need to ask the cidr provider to create an IPv6 RDNS record or delegate control to you, so you can create the IPv6 record
If you are not using IPv6 and have no cidr IPv6 range, then you would be better turning off IPv6 in your network settings. Ssh into server, vi /etc/sysconfig/network-scripts/ethcfg <or whatever your network config is called> and tell it not to use IPv6
