classification property

String? classification

The bucket the bounce classifier assigned, for failures.

Known values include InvalidRecipient, BadDomain, InactiveMailbox, InvalidSender, QuotaIssues, NoAnswerFromHost, BadConnection, DNSFailure, RoutingErrors, TransientFailure, MessageExpired, ProtocolErrors, AuthenticationFailed, PolicyRelated and Uncategorized. The set is open: keep a fallback for other values.