[U-Boot] DSN: failed (Delivery reports about your e-mail)

This is a Delivery Status Notification (DSN).

I was unable to deliver your message to vjsyntex@vsnl.com.

I said RCPT TO:vjsyntex@vsnl.com

And they gave me the error; 550 5.1.1 unknown or illegal alias: vjsyntex@vsnl.com