2.1.4.4 original-forward-path Field
The original-forward-path field contains the email address of the recipient that was redirected to the address contained in the forward-path field. The address contained in the original-forward-path field MUST be formatted in one of the following formats:
Neither format is preferred over the other. The choice of format is left to the implementation.
The original-forward-path field, although syntactically identical to the forward-path field, has different semantics. The appearance of the redirection-type and original-forward-path fields in an occurrence of the recipient-specification field indicates that the original message was sent to the recipient with the address contained in the original-forward-path field and the server did one of the following:
Changed the recipient address to the address contained in the forward-path field.
Added a new recipient with the address contained in the forward-path field due to the recipient with the address contained in the original-forward-path field being present.
If the redirection-type and original-forward-path fields are omitted, the server did not have information about what type of forwarding or expansion was done on the recipient when it generated the journal record message.