RSS Feed/News Email Suddenly Rejected By Google Mail

[ENXF NET]

Suddenly all emails from my board have been rejected by gmail with this message :

Gmail has detected that this message is likely unsolicited mail. To reduce the amount of spam sent to Gmail, this message has been blocked. For more information, go to https://support.google.com/mail/?p=UnsolicitedMessageError
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In xenforo mail options, i use "PHP built-in mail system" as "Email transport method"

DKIM etc are set up.
The only problems i have in Google Postmaster Tool :

1. ...

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