[Exim] (quite ot) pop3 client for virtual users

I have this config:
- Exim delivers all the mails for local and virtual users
- The virtual user passwd files are located in /etc/vmail/passwd.$domain
- The virtual mail files are in /var/spool/vmail/$domain/$local_part

What do you believe is the most suitable pop3 client for use with exim and this kind of
config for virtual domains? there's no
performance issue

Thanks in advance