Lookup for "250 5.0.0"
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 (250)
Requested mail action okay, completed
Enhanced Status Code Details (5.0.0)
Other undefined Status
Other undefined status is the only undefined error code. It should be used for all errors for which only the class of the error is known.