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What is smtp
SMTP (Simple Mail Transfer Protocol) is an internet standard protocol for sending electronic mail (email) messages between servers. It is a text-based protocol that uses a client-server model.
How SMTP Works:
Connection: The email client (e.g., Outlook, Gmail) establishes a TCP connection with the SMTP server on port 25.
Greeting: The client sends a greeting message to the server, identifying itself.
Authentication: If required, the client authenticates with the server using a username and password.
MAIL FROM: The client sends the MAIL FROM command to specify the sender's email address.
RCPT TO: The client sends one or more RCPT TO commands to specify the recipient's email address(es).
DATA: The client sends the DATA command to start transmitting the email message.
Message Body: The client sends the email message, including the subject, body, and any attachments.
QUIT: The client sends the QUIT command to end the session.
Key Features of SMTP:
Simple and Text-Based: SMTP is a relatively simple protocol that uses text commands and responses.
Client-Server Model: It operates on a client-server model, where the email client connects to an SMTP server to send messages.
Reliable Delivery: SMTP employs mechanisms to ensure reliable delivery of email messages, even in the event of network interruptions.
Authentication: SMTP supports authentication mechanisms, such as SMTP AUTH, to prevent unauthorized access to email servers.
Encryption: SMTP can be used with encryption protocols, such as TLS (Transport Layer Security), to protect email messages from eavesdropping.
Uses of SMTP:
SMTP is primarily used for sending email messages from email clients to email servers. It is also used by email servers to relay messages to other servers and deliver them to recipients.
