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nexus/wiki/concepts/SMTP.md
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---
title: "SMTP"
type: concept
tags:
- email
- protocol
- networking
---
## Aliases
- SMTP
- Simple Mail Transfer Protocol
- 简单邮件传输协议
## Description
用于发送和转发邮件的标准互联网协议。SMTP 是电子邮件发送的基础协议,大多数邮件服务器都支持 SMTP 接口。
## How It Works
1. MUA邮件用户代理通过 SMTP 将邮件提交给 MSA邮件提交代理
2. MSA 将邮件传递给 MDA邮件投递代理
3. MDA 将邮件投递到收件人邮件服务器
4. 收件人通过 POP3/IMAP 获取邮件
## Port Numbers
- 25标准 SMTP非加密
- 465SMTPSSMTP over TLS
- 587Mail Submission邮件提交端口
- 2525备选端口
## AWS SES Integration
- SES 提供 SMTP 端点,支持标准 SMTP 认证
- IAM 用户凭证转换为 SMTP 用户名和密码
- 支持通过 VPC 终端节点私有访问
## Related Concepts
- [[AWS SES]]
- [[DKIM]]
- [[SPF]]
- [[DMARC]]
## Sources
- [[ctp-topic-12-using-ses-smtp-service-terraform-module]]