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technology/internet/SMTP.md
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@ -6,7 +6,7 @@ rfc: https://datatracker.ietf.org/doc/html/rfc5321
---
# Simple Mail Transfer Protocol
Simple Mail Transfer Protocol (SMTP) is a protocol used for the transmission of electronic mail ([email](eMail.md)) over a computer network. SMTP is a text-based protocol that facilitates the sending and receiving of [emails](../../../Server/eMails.md) between servers and is a fundamental component of [email](eMail.md) communication on the internet.
Simple Mail Transfer Protocol (SMTP) is a protocol used for the transmission of electronic mail ([email](eMail.md)) over a computer network. SMTP is a text-based protocol that facilitates the sending and receiving of [emails](eMail.md) between servers and is a fundamental component of [email](eMail.md) communication on the internet.
## Key Concepts
### 1. **Message Transfer:**
@ -18,7 +18,7 @@ Simple Mail Transfer Protocol (SMTP) is a protocol used for the transmission of
### 4. **Commands and Responses:**
- SMTP communication involves a series of commands and responses between the client and server. Common commands include `HELO` (client identification), `MAIL FROM` (specify sender address), `RCPT TO` (specify recipient address), `DATA` (begin message data input), and `QUIT` (terminate the session).
### 5. **Relaying:**
- SMTP allows for the relaying of messages between different [email](eMail.md) servers, facilitating the delivery of [emails](../../../Server/eMails.md) across different domains.
- SMTP allows for the relaying of messages between different [email](eMail.md) servers, facilitating the delivery of [emails](eMail.md) across different domains.
## SMTP Operation
### 1. **Handshake:**