Lookup for "552 5.2.0"
Permanent Error - This status code indicates a permanent issue and is unlikely to resolve itself. You should contact the Email Service Provider.
Basic Status Code Details (552)
Requested mail action aborted: exceeded storage allocation
Enhanced Status Code Details (5.2.0)
Other or undefined mailbox status
The mailbox exists, but something about the destination mailbox has caused the sending of this DSN.