Help: avoid download same messages from pop3 sever

[ching wang]

Dear Mutt users,

I am new to mutt, and just started to use it to retrieve mail from a
pop3 account on my ISP. I have trouble figuring out a way to avoid
downloading the same messages whenever I hit shift-g.  I don't have this
problem when using netscape mail: it will not download messages already
in my local mailbox.

Please help. I really like to see if I can use mutt exclusively as my
MUA.
Thanks in advance.

CWang