[Mailman-Users] How to stop these Non-sense mails?

[Kabilan L]

Hai!!!!

I am getting  lot spam-mails.The following are the examples.
How can i stop these  things!!!

From: carolwhitaker_tc at pacbell.net on Sun Feb 26 21:34:01 2006
Subject: Stocks That Rock
Cause: Post by non-member to a members-only list

From: attorney at ci.garland.tx.us on Sun Feb 26 21:58:59 2006
Subject: S0FT C1alis, branded quality
Cause: Post by non-member to a members-only list

From: wilmawallace at fordofsouthholland.com on Sun Feb 26 23:41:36 2006
Subject: Photoshop software for 80 % 0ff at Diane's softgroup
Cause: Post by non-member to a members-only list

From: mallory.ncamp_bc at land-5.com on Mon Feb 27 01:58:17 2006
Subject: The Stock Profiler
Cause: Post by non-member to a members-only list

From: jrobison at 1-800-arkansas.com on Mon Feb 27 03:00:06 2006
Subject: (no subject)
Cause: Post by non-member to a members-only list 


Help me Please! Thank You all


Kabilan.L
Department of Electrical Engineering
IIT Madras
Chennai - 600 036
Tamil Nadu, INDIA


"The secret to winning football games is working more as a team, less as
individuals. I play not my 11 best, but my best 11." ->Knute Rockne