Hi Lakshmi,
After looking at the error I can say the trust anchor
is not available in your hisp server (direct project configuration)
that you hosted.
Please download this der file from the below link.
https://github.com/siteadmin/ett/raw/resources/certificates/common/sitenv.org/intermediate.sitenv.org.derNow
browse your direct project config-ui and then click on Anchors, and
upload this file in the trust anchor and wait 5 min or restart your
james server.
And try to send email from ETT tool, so it will work.
I hope this helps you.
Thanks,
Harry