[Exim] virtual domains - popper

I'm trying to set up a virtual domains setup but I have one problem, I belive I
can set up exim to do what I want, but what pop3 program can I use to get the
virtual domain mail

my plan is to set up every domin wiht its own /var/spool/mail/domain/user
but I can't seem to fina poper I can set to get the mail in the same way