Just add the FQDN of Jaya in your hosts file to get rid of that error message.
I suspect that isn't the issue but let's start with the simple stuff first
Modify /etc/hosts, adding the entry 'jaya.<your.domain.name>' to the end of the line for jaya's address.
The sendmail error should then go away. If mail is still not working to outside-world addresses, get the error message from /var/adm/messages (just grep for 'sendmail') and post it back.
I'd recommend against using a capital letter at the start of that hostname too -
most of the addressing is case insensitive but every now and then you get a tool that isn't and it causes problems.