X400-Received:

X400-Received:

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Received via X.400

X.400

The X400-Received: header is added by IDA sendmail to document receipt of a mail message from an X.400 network. This header is used by both IDA and V8 to count the number of forwarding sites when computing the hop count of a mail message.

The X400-Received: should never be declared in the configuration file.