Some people send the silliest things and then everything goes haywire.
 
> Received: by UIUCVMD (Mailer X1.23) id 2457; Thu, 09 Oct 86 09:22:34 CDT
> Date: Thu, 09 Oct 86 09:22:33 CDT
> From: Network Mailer <MAILER@UIUCVMD>
> Subject: Undelivered mail
> To: LISTSERV@UIUCVMD
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> Your mail was not delivered to some or all of its
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> --------------------RETURNED MAIL FILE--------------------
> Received: by UIUCVMD (Mailer X1.23) id 2456; Thu, 09 Oct 86 09:22:33 CDT
> Date:         Thu, 9 Oct 1986 09:22 CDT
> From:         Revised List Processor (1.4c) <LISTSERV@UIUCVMD>
> Subject:      Important message
>
> File (7947) is not a standard IBM NOTE.