Simple C Quiz - Wrong Email ids have been entered by two students

Dear students of TY Mechanical A and B Division, 

please take care.

Mail Delivery Subsystem <mailer-daemon@googlemail.com>	12:39 PM (3 minutes ago)
to me

Address not found Your message wasn't delivered to samarthschavan@coep.sveri.ac because the domain coep.sveri.ac couldn't be found. Check for typos or unnecessary spaces and try again.

The response was: DNS Error: 6975735 DNS type 'mx' lookup of coep.sveri.ac responded with code NXDOMAIN Domain name not found: coep.sveri.ac

Mail Delivery Subsystem <mailer-daemon@googlemail.com>	12:39 PM (1 minute ago)
to me

Address not found Your message wasn't delivered to santoshhpatil@ceop.sveri.ac.in because the domain ceop.sveri.ac.in couldn't be found. Check for typos or unnecessary spaces and try again.

The response was: DNS Error: 6660789 DNS type 'mx' lookup of ceop.sveri.ac.in responded with code NXDOMAIN Domain name not found: ceop.sveri.ac.in