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Which one of the following is an SMTP server configured in such a way that anyone on the internet can send e-mail through it?(a) open mail relay(b) wide mail reception(c) open mail reception(d) short mail receptionI had been asked this question during an interview.This is a very interesting question from SMTP topic in division Application Layer of Computer Network

Answer»

Correct answer is (a) open mail relay

For EXPLANATION I WOULD say: Anyone can send an e-mail through an Open Mail Relay server so it acted like a free relay for email agents to forward their mails through. Open Mail RELAYS are now unpopular because they can be USED by attackers to perform man-in-the-middle attacks.



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