another mutt/fetchmail question

[Thomas Isenbarger <isen@xxxxxxxxxxx>]

I am running mutt 1.4.2.2i with fetchmail and esmtp on NetBSD 3.1  
installed on a Mobilepro 790.

I have my mail system set up to poll two servers.

my .fetchrc:

poll server1
        protocol pop3
        user username1
        password '****'

poll server2
        protocol pop3
        user username2
        password '****'

for the first server, all new mail is downloaded every time, but for  
the second server messages previously downloaded by mutt are  
skipped.  since my configuration here is set up the same for both  
servers, I think there must be something specific to the first server  
that causes this to happen.  How can I start to troubleshoot this?

Thank-you,
isen