Adding some independent observations to Dick's message (far below), ...
 
As a List Owner of three cmsa.berkeley.edu lists, I've noticed for the
past several weeks that none (of the two active lists) is getting
any messages directed to <listname>-Request, Owner-<listname>, nor
to the Errors-to address. One of my lists was, until a couple
weeks ago causing a dozen Errors-to messages a day --for years, so
I know something recently broke. A couple of weeks ago was the
weekend spam storm --any relationship?
 
I don't know if Dick Peter's console message relate to this problem,
but they seem suspiciously to do so.
Peter Rauch
 
>Date:         Tue, 26 Mar 1996 19:54:07 PST
>From: "Richard A. Peters" <[log in to unmask]>
>Organization: Central Computing Services, Univ. of California at Berkeley
>Subject:      Message Unauthorized origin
 
>We have begun getting the message "Unauthorized origin ..." for mail
>being sent to owner-[listname], etc.  Anyone know where I should
>start looking to see what has changed or where to fix this problem?
>A sample of the messages in the console log is below.
 
>26 Mar 1996 13:07:13 Processing file 6997 from MAILER@UCBCMSA
>26 Mar 1996 13:07:13 From [log in to unmask]: X-ADMMAIL OWNER-BACKUP-L ...
>26 Mar 1996 13:07:13 Unauthorized origin - ignored.
 
>                                         Richard A. Peters