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I have this issue, I am not able to send or receive emails when I send them for example from: info@example.com to enq@example.com if I send an email to external mail service such as gmail, yahoo, hotmail everything is delivered as should and also I can receive emails from external services perfectly fine. I am using php mail to send, also I am using VPS with CentOS and ISPconfig ( no Cpanel ). Is there something I can do to fix this?