> Good morning, all. I have an owner who received this message
> many times and claims to have only sent the message once. Any
> ideas why? Thanks.
> 
> 
> Your message  is being returned to you unprocessed because it
>  appears to have
> already been distributed to the  ANTHROPOLOGY-MAJORS-L list.

As WBrown pointed out, the message could have been duplicated en-
route. L-Soft has a nice FAQ on duplicates here:
http://www.lsoft.com/manuals/lsv-faq.stm#_Toc64429896

However, what this owner is most likely seeing is a post of his is 
being "reflected" back to the list address (rather then bouncing 
according to standards) by a faulty mailer of one of his subscribers.