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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: 42959
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
I agree. Here's the link:
subject: Unknown host exception
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