Exception When Sending Mail (Suffering for long time)

[Bibhishan Karadkar]

I have a problem of sending javamail, my application of sending a mail is working fine at home on standalone machine with dial-up connection but problem at work on network ,
It is showing following error
javax.mail.SendFailedException: Sending failed; nested exception is: javax.mail.MessagingException: Unknown SMTP host: mail.ip.eth.net; nested exception is: java.net.UnknownHostException: mail.ip.eth.net

I checked at telnet my hosts 25 & 110
my host with port 25
it replying
220-ip.eth.net Microsoft SMTP MAIL ready at Mon, 8 Oct 2001 11:56:42 +0530 Versi
on: 5.5.1877.467.46
220 ESMTP spoken here
& port 110 it replying with
+OK Microsoft POP3 Server Version: 5.5.1877.117.11 ready <[e-mail].
net>
any problem with my network any sugessions please
please help me in detail beca. I am new to networking
Thanks
Bibhishan