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wiki/concepts/SMTP.md
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wiki/concepts/SMTP.md
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title: "SMTP"
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type: concept
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tags:
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- email
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- protocol
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- networking
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---
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## Aliases
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- SMTP
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- Simple Mail Transfer Protocol
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- 简单邮件传输协议
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## Description
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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。
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## How It Works
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1. MUA(邮件用户代理)通过 SMTP 将邮件提交给 MSA(邮件提交代理)
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2. MSA 将邮件传递给 MDA(邮件投递代理)
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3. MDA 将邮件投递到收件人邮件服务器
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4. 收件人通过 POP3/IMAP 获取邮件
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## Port Numbers
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- 25:标准 SMTP(非加密)
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- 465:SMTPS(SMTP over TLS)
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- 587:Mail Submission(邮件提交端口)
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- 2525:备选端口
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## AWS SES Integration
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- SES 提供 SMTP 端点,支持标准 SMTP 认证
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- IAM 用户凭证转换为 SMTP 用户名和密码
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- 支持通过 VPC 终端节点私有访问
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## Related Concepts
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- [[AWS SES]]
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- [[DKIM]]
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- [[SPF]]
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- [[DMARC]]
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## Sources
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- [[ctp-topic-12-using-ses-smtp-service-terraform-module]]
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