Thanks for your reply.
for Domain Authentication :
Yes, I will try to authenticate ASAP.
From Email
I am insuring that form email have verified in sendgrid account.
Sendgrid email logs
in log, there are every mail in delivered status
It looks like Domain Authentication is the problem. I will let you inform after Domain Authentication. Meanwhile If you want to suggest any thing please keep posted. It would be helpful for me to resolve ASAP.
Thanks