qmail-pop3d and fetchmail

[Eng. Ramy M. Hassan]

I was trying to use fetchmail to retrieve messages from a pop3 account
on a server running qmail-pop3d using tcpserver and vchkpw. It retrieved
all the messages although I did not specify "--all" flag to fetchmail. I
tried several time and every time fetchmail retrieves all the messages
again and again.
I tried fetchmail with another pop3 account on a server running
sendmail/qpoper and it worked fine, only new messages was retrieved.
Anybody knows why that happens ?

Thanks.