Sending mails

Hi To all,

i am implementing a application in Web dynpro using java, my application has two errors , which are :

1. when i am sending mails to the gmail or yahoo,instead of my local intranet excahnge server it is not sending the mails and giving errors as the email address is not valid.

2. in every single case in which i am able to send mails to the local intranet excange server. after successful execution of the application i am getting java.lang.IllegalStateException.

So can u please help me.....

With Regrards

Kapil Avasthi