validating domain

is there any way to find wether given mail id domain valid or not?suppose if i give raghu@xyz.com.how can i find wether xyz domain exists or not using java.thank you.
[187 byte] By [RAGHURAJREDDYa] at [2007-10-3 4:58:14]
# 1
Send a mail to it and see whether it bounces for a "doesn't exist" reason.That is, if it's just the domain, you can try to open a socket connection to the mail server or domain.
CeciNEstPasUnProgrammeura at 2007-7-14 23:03:36 > top of Java-index,Java Essentials,Java Programming...