undelivered mail return

[vs_isp]

Where should i go in the panel to check the dns records? I ve change manually the mx records of a specific client inside ispcp in order to match them with the external mx google apps records with no luck once again.
I also reverted settings in the "main.cf" file. I have tried various configurations and settings from disabling mail to changing configs but mails keep bouncing back. I really need your help guys.