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This is considered a fatal error. A retry will not be made.
|Parameters||code||The SMTP response code associated with this error.|
|resp||The string response associated with this error.|
|log||A string log of the exchange leading up to and including the error. (type: |
|isFatal||A boolean indicating whether this connection can proceed or not. If True, the connection will be dropped.|
|retry||A boolean indicating whether the delivery should be retried. If True and the factory indicates further retries are desirable, they will be attempted, otherwise the delivery will be failed.|