File APIs for Java Developers
Manipulate DOC, XLS, PPT, PDF and many others from your application.
The moose likes Java in General and the fly likes Unknown host exception Big Moose Saloon
  Search | Java FAQ | Recent Topics | Flagged Topics | Hot Topics | Zero Replies
Register / Login

Win a copy of RabbitMQ in Depth this week in the Open Source forum!
JavaRanch » Java Forums » Java » Java in General
Bookmark "Unknown host exception" Watch "Unknown host exception" New topic

Unknown host exception

Nila dhan
Ranch Hand

Joined: Sep 15, 2005
Posts: 161
Hi pals,
I am trying to send email from my application .But the exception occurs

javax.mail.SendFailedException: Sending failed;
nested exception is:
javax.mail.MessagingException: Unknown SMTP host:

What could be wrong here.Any suggestions?

BTW if i send mail from another system using the same application,it works!!!
Ulf Dittmer

Joined: Mar 22, 2005
Posts: 42956
What do you specify as the SMTP host? It looks like it is not recognized or even empty.
Sandeep Murthy
Ranch Hand

Joined: Oct 05, 2005
Posts: 34
i) Check if you have the required jar files ( mailer.jar, activation.jar, ...) in your class path.
ii) Disable any antivirus program running while trying to send mails. The antivirus may be scanning the ports and block it.

SCJP 1.4
Consider Paul's rocket mass heater.
subject: Unknown host exception