At 11:06 03/25/1999 Thursday -0500, you wrote:

|I have now set Daily-Threshold to 20 (we rarely have more than 10
|postings per day) in case it happens again.
|
|What can I do to prevent this from happening again?  We also have
|Loopcheck=Full but that did not prevent it.

Though LISTSERV(R) is not bullet-proof, you're having a difficulty with
one particular userid (and their mail system).  This userid is best
tracked down by observing these abstracted headers:

Received: from rmx08.globecomm.net (rmx08.iname.net [165.251.8.85])  by
          klokan.sh.cvut.cz (8.8.8/8.8.8/Silicon Hill/Antispam/29.3.1998) with
          ESMTP id TAA10316 for <[log in to unmask]>; Fri, 12 Mar 1999
19:40:37
          +0100
Received: from smv18.iname.net  by rmx08.globecomm.net (8.9.1/8.8.0) with SMTP
          id NAA13897 ; Fri, 12 Mar 1999 13:40:07 -0500 (EST)
Received: from listserv-mail.surfnet.nl (listserv-mail.surfnet.nl
          [192.87.5.141])  by smv18.iname.net (8.9.1a/8.9.1SMV) with ESMTP id
          NAA18581 for <[log in to unmask]>; Fri, 12 Mar 1999 13:39:50 -0500
          (EST)

As reported previously herein, look for userids@

globecomm.net
iname.net

and possibly

[log in to unmask]

Take appropriate action by NOT distributing individual emails (though
possibly SETing them to DIGEST or INDEX, or even DELETE) the offending
subscriber.

/Pete