To add to  the recent discussions. I  get one or two of  these every week
(from different  sites of  course). Speak about  standards, but  at least
there's a decent Subject which is recognized by the loop detection.
 
>Date:     Mon, 22 Oct 90 13:57 MDT
>From:     <POSTMASTER@UNMB>
>Subject:  Returned Network Mail
>To:       REICHETZ@AWIIMC11
>Original_To:  BITNET%"[log in to unmask]"
>
>Your mail is being returned to you.
>Reason for return is:
>
>-RMS-E-CRE, ACP file create failed
>-SYSTEM-F-EXDISKQUOTA, disk quota exceeded
>Returned mail follows:
>------------------------------
>Received: From ASUACAD(MAILER) by UNMB with Jnet id 8506
>          for SDAY@UNMB; Mon, 22 Oct 90 13:57 MDT
>Received: by ASUACAD (Mailer R2.07) id 5046; Mon, 22 Oct 90 13:00:25 MST
>Date:         Fri, 19 Oct 90 11:45:52 SET
>Reply-To:     "Forum on LISTSERV release 1.6" <[log in to unmask]>
>Sender:       "Forum on LISTSERV release 1.6" <[log in to unmask]>
>From:         "Christian J. Reichetzeder" <[log in to unmask]>
>Subject:      Re: loop with listserv
>X-To:         LISTEARN Discussion list <[log in to unmask]>
>To:           "STEPHEN F. DAY" <[log in to unmask]>
>In-Reply-To:  Message of Fri,
>              19 Oct 1990 11:16:10 +0100 from <[log in to unmask]>