Cannot receive emails Australia

Cannot receive emails Australia

Everything was working before today. Nothing changed on options or settings etc. All of sudden, we have no emails coming in, not even spams.

We have tried sending emails, seems working. But still cannot receive any .

Used gmail, hotmail and webpage to send emails, but none of them can be received.

The only emails you can receive are the ones sent from the same email account, namely you send to yourself.

Please address this issue asap before we move to business plan.