Gmail reject our domain mail.

Dear support,
We are facing a problem sending mails to gmail accounts and every time we are getting the error below however our exchange 2010 server doesn't use IP6!
" Our system has detected that this message does not meet IPv6 sending guidelines regarding PTR records and authentication"
Who is Participating?
Vijaya Babu SekarAssociate Ops ManagerCommented:
Normally IPv6 protocol configuration not required to configure, so could you please try to disabled the IPv6 through registry. so that you can not get this issue.

you may follow the below link for disable the IPv6

Do you create reverse dns lookup for your email domain?
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*** Hopeleonie ***IT ManagerCommented:
What is your Email domain?
mmmokyAuthor Commented:
Dear All

Thank you all for your support and your interest in helping, on the other hand, I've done the steps which suggested by Dipak1383 and we just test it and it seems working fine till now but i need to monitor it for longer in order to share with you the right feedback.

- All what i've done just created one DWORD (32-bit) Value in the server registry and restart the server and start sending to different gmail accounts and untill now it works fine.
mmmokyAuthor Commented:
"New Update"

All the mails sent to Gmail accounts successfully, however after we disable the IP6 on the exchange server we can not access the server remotly!

please advise.
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