Title: How can I quickly stop messages from getting sent out?

Question: My list is being abused and/or there is a mailing loop, how can I
quickly shut my list down for the time being, to prevent any further emails
from getting sent?

Answer:

Log into the administrative pages for your list at:

http://lists.nmsu.edu/mailman/admin/yourlistname

where "listname" is the name of your list.  If you are not already there, 
go to "General Options".  Now scroll down to the bottom of the page, and 
look for the section titled "Additional settings".  The first 
option under this section should be "emergency".  Set this to "Yes" to 
start emergency moderation.  

When this option is set, all mail sent to the list will be held for
moderation.  When the problem has been resolved, you can allow your list 
operation to go back to normal by going back and changing this option back 
to "No".