finalRecipient

The email address that the message was ultimately delivered to. This corresponds to the Final-Recipient in the DSN. If not specified, FinalRecipient is set to the Recipient specified in the BouncedRecipientInfo structure. Either FinalRecipient or the recipient in BouncedRecipientInfo must be a recipient of the original bounced message.

Do not prepend the FinalRecipient email address with rfc 822;, as described in RFC 3798.