pop service not wroking in Linux Enterprise 4

I have installed linux Enterprise 4 . using sendmail for mail server.
but my client did not get their email on pop accounts.

how & where pop services are open in Enterprise 4 , Is there any software require.
pls guide.

 

You must install a POP3 daemon like Dovecot.
What's the output of

Code:

netstat -tap

?