What is the default port number for SMTP (Simple Mail Transfer Protocol)?

Correct option is B

The default port number for SMTP is 25. This port is used for email transmission between mail servers.
Important Key Points:
1. SMTP (Simple Mail Transfer Protocol) uses port 25 as the default port for sending emails between servers.
2. SMTP is responsible for the delivery of email messages, making it an essential part of the email communication process.
3. Modern systems may also use port 587 for client-to-server communication, especially with encryption.
Knowledge Booster:
· Port 21: Used by FTP (File Transfer Protocol) for controlling data transfer.
· Port 80: Assigned to HTTP (Hypertext Transfer Protocol), used for browsing websites.
· Port 110: Utilized by POP3 (Post Office Protocol 3), which is used to retrieve emails from a remote server to a local client.
· Port 443: Used by HTTPS (Hypertext Transfer Protocol Secure), enabling secure browsing through encrypted communication.