552 5.1.1 Mailbox delivery failure policy error

552 5.1.1 Mailbox delivery failure policy error

Hi,
I'm having trouble with the account reception@geranionvillage.gr. It does not receive email. It returns the following message:
The response from the remote server was:
552 5.1.1 < reception@geranionvillage.gr> Mailbox delivery failure policy error.

Yesterday I upgraded to the standard plan, for more storage, but nothing has changed yet. Can you see what's going on please?

Thank you for your time.

Spiros S.