What mechanism does an internet email communication layout use to notify a sender that a designated recipient mailbox address is completely invalid or non-existent?
A. Encrypting the sender's system password variables
B. Running automatic DNS reverse lookup queries inside terminal devices
C. Returning an automated 'Hard Bounce' or 'Undelivered Mail' notification error message from the mail server
D. Altering the local browser cache layout automatically
Answer: Option C
Solution (By JKSSB Mock Tests)
A hard bounce is a permanent delivery failure message indicating that an email address is invalid, typo-ridden, or has been permanently deactivated by the hosting provider.
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