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problem with rDNS and gmail

Started by giggeek, August 24, 2013, 04:26:29 PM

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SMTP was working fine till today now I suddenly get this error.
The sender does not meet basic ipv6 550-5.7.1 sending guidelines of authentication and rdns resolution of sending 550-5.7.1 ip.
anyone have any idea why or what could be causing this?