undelivered mail return

[vs_isp]

Hi again,
So, i've tried the gui method. Still no luck. This is driving me insane. I changed the email limit to "-1", then changed the traffic volume to a value and change it back again.Although the entry was deleted from the domains file, still i could not receive anything in my apps account. I also tried this with a wordpress contact form and the same thing is happening also. Any help/suggestion please?

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UPDATE: I 've been searching the mail.log file and i have found that the last entry has a message:
"mail for xxxxxx.gr loops back to myself".
also postfix/bounce: sender non-delivery notification.
and postfix/qmgr: removed

Am i doing something wrong here? I would appreciate any advice/help/suggestion, thank you in advance.