Which protocol is used for sending, but can also be used for receiving e-mail?a) VoIP b) SMTP c) PPP d)HTTP

To determine which protocol is used for sending but can also be used for receiving email, let’s analyze the available options:

1. VoIP (Voice over Internet Protocol): This protocol is primarily used for voice communications over the internet and is not related to email.

2. SMTP (Simple Mail Transfer Protocol): This protocol is used for sending emails. While its main function is to send messages, SMTP itself is not used for receiving emails.

3. PPP (Point-to-Point Protocol): This protocol is used for connecting two points over a network, primarily for internet connections. It is not related to email functionality.

4. HTTP (Hypertext Transfer Protocol): This protocol is used for transferring web pages on the internet and does not pertain to email.

The correct answer is b) SMTP. While SMTP is primarily used for sending emails, receiving emails is typically handled by other protocols such as POP3 (Post Office Protocol) or IMAP (Internet Message Access Protocol). However, in a strict sense, SMTP itself can be part of a setup that includes both sending and receiving by allowing relaying of messages upon initial receipt. Thus, option b) SMTP is the best answer given here.