PHP Send mail stopped working

I had not to long ago had downloaded send mail for php as soon as I did everything seemed to work as expected though I noticed about 10 days ago all the emails stopped and I recently confirmed they are not being sent out properly with some research of my own I decided to look into /var/mail and check out the logs and had noticed this
Our system has detected that this
<<< 550-5.7.1 message does not meet IPv6 sending guidelines regarding PTR records
<<< 550-5.7.1 and authentication. Please review
<<< 550-5.7.1 https://support.google.com/mail/?p=IPv6AuthError for more information
I tried to review the link that ended up not having an existing forum as well as looking up fixes online so far with no luck I had also noticed in the TO: line that it appeared to send it to the wrong host but have no idea where it would get the wrong name ([email protected] id think it would instead be something like [email protected]?) any help is greatly appreciated as this is a very critical issue nearly my entire site is based upon using emails

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message does not meet IPv6 sending guidelines regarding PTR records

I would think you're missing a reverse lookup (PTR record) for IPv6.

You can set this up on cloud.linode.com by clicking on your node and then choosing Networking tab.

@kmansoft I have set a reverse look up with the dns manager though I am currently still having the issue it did say it may take up to a day to go through as well as I went into the host file to confirm everything was correct (found the 900net changed it to 9000net) though it had been working before so I do not see that being the issue thank you for your help hopefully this will all resolve itself within 24 hours when the dns goes through

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