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zmailer bounces being sent To: @

One of my Zmailer hosts is generating those, and I can't figure out where
that "@" comes from.  Zmailer 2.99.54p1.

Here's a typical example, indented for clarity.

    rcvdfrom STDIN ("??"@lupinella.troll.no)
    channel error
    todsn ORCPT=rfc822;@
    to <@>
    To: @
    From: The Post Office <postmaster>
    Sender:	mailer-daemon
    Subject: Delivery reports about your email [FAILED(1)]
    MIME-Version: 1.0
    Content-Type: multipart/report; report-type=delivery-status;
    This is MULTIPART/REPORT structured message as defined at RFC 1894.
    Ask your email client software vendor, when will they support this
    report format by showing its formal part in your preferred language.
    Content-Type: text/plain
    This is a collection of reports about email delivery
    process concerning a message you originated.
    Some explanations/translations for these reports
    can be found at:
      Original Recipient:
      Control data:
        smtp hotmail.com niagra4899@hotmail.com 65534
      Diagnostic texts:
        <<- MAIL From:<@> SIZE=10582
        ->> 250 Requested mail action okay, completed
        <<- RCPT To:<niagra4899@hotmail.com>
        ->> 550 Requested action not taken: mailbox unavailable
    Following is a copy of MESSAGE/DELIVERY-STATUS format section below.
    It is copied here in case your email client is unable to show it to you.

Naturally, these files immediately cause another fault.

Any ideas?