dupe checking

[Manuel Bessler]

Hi

does mutt have something like a dupe checker (or is there an external 
program that's capable of this)? 
one of my mail servers is slow and if fetchmail times out, it starts 
from the beginning because
my mail server flushes the mails _after_ the POP3 session. 
removing all mails that are twice or even more times downloaded are 
filling up my mailboxes.

Regards,
Manuel