Delhi Police Constable Exam Model Paper 8

SMTP stands for Simple Mail Transfer Protocol.

• SMTP is an internet protocol that helps to send emails
• It is a connection-oriented, text-based protocol.
• SMTP was first defined in 1982.
• Communication between mail servers generally uses the standard TCP port 25 designated for SMTP.

Some of the commonly used protocols are:

1. FTP: File Transfer Protocol.
2. TELNET.
3. SSH: Secure Shell.
4. POP3: Post Office Protocol.
5. HTTP: HyperText Transfer Protocol.
6. IMAP4 Internet Message Access Protocol.
7. HTTPS: Hypertext Transfer Protocol Secure.
8. PPP: Point to Point Protocol.
9. TCP: Transmission Control Protocol.
10. Usenet Protocol