POP checking with Qmail + LDAP

[Le Dinh Long]

Can anybody had experiences with qmail+LDAP figure out POP checking flow ? 
Assume there are two real POP3 mail servers: foo.domain.com and 
bar.domain.com, LDAP server ldap.domain.com, SMTP server smtp.domain.com. 
How to configure the POP mail clients to work  with this schema ? How does 
they work ?
Thanks and forgive 4 bad English -:)