when i tried the sample program to read mails from my yahoo smtp server i get NO ROUTE TO HOST EXCEPTION

avax.mail.MessagingException: Connect failed;
nested exception is:
java.net.NoRouteToHostException: Operation timed out: no further information

at com.sun.mail.pop3.POP3Store.protocolConnect(POP3Store.java:106)

at javax.mail.Service.connect(Service.java:234)

at javax.mail.Service.connect(Service.java:135)

at bulkmail.mailsample.main(mailsample.java:31)

how can solve this..?

thanks in advance