On Sun, 5 Sep 1999 16:53:29 EDT, Michael Holloway <[log in to unmask]>
wrote:

>Apparently, Brightlight filters out the message because of the blank
>Return-Path line, and some bug causes the messages to disappear into the
>ether.

It's not a bug, it's just that they are flat out blocking such mail, an act
which makes them non-compliant with internet mail standards.  Check the LISTSERV
Support FAQ:

  http://www.lsoft.com/lsv-faq.html#5.16