On Fri, 25 Mar 2011, James M Pulver wrote:

> Though I don't actually see a List-ID header for these . . .

It is running listserv so I think it adds various List-... headers. 
Personally I filter on the Return-path (ie the envelope sender) but not 
all mail systems make that particularly easy...

-- Jon

-- 
/--------------------------------------------------------------------\
| "Computers are different from telephones.  Computers do not ring." |
|       -- A. Tanenbaum, "Computer Networks", p. 32                  |
---------------------------------------------------------------------|
| Jon Peatfield, _Computer_ Officer, DAMTP,  University of Cambridge |
| Mail:  [log in to unmask]     Web:  http://www.damtp.cam.ac.uk/ |
\--------------------------------------------------------------------/