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content/Network-How-email-works-3.md
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title = "电子邮件是如何工作的:自建域名邮箱"
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date = 2024-02-22
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[taxonomies]
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tags = ["网络艺术"]
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前言 poste.io 邮件服务基于 Docker 搭建,用的是 Haraka + Dovecot + SQLite 邮件系统,占用资源较少,安装简单,适合个人使用。
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<!-- more -->
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## VPS上的配置
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### 修改VPS hostname
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```
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hostnamectl set-hostname mail.your-domain.com
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```
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### 修改hosts文件
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```
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vim /etc/hosts
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```
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添加一行
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```
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127.0.1.1 localhost.localdomain mail.your-domain.com
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```
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## 安装poste
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docker compose文件示例:
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```
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version: '3.7'
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services:
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mailserver:
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image: analogic/poste.io
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hostname: mail.your-domain.com
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ports:
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- "25:25"
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- "110:110"
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- "143:143"
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- "587:587"
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- "993:993"
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- "995:995"
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- "4190:4190"
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- "465:465"
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- "127.0.0.1:8808:80"
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- "127.0.0.1:8843:443"
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environment:
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- LETSENCRYPT_EMAIL=admin@your-domain.com
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- LETSENCRYPT_HOST=mail.your-domain.com
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- VIRTUAL_HOST=mail.your-domain.com
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- DISABLE_CLAMAV=TRUE
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- TZ=Asia/Shanghai
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- HTTPS=OFF
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volumes:
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- /etc/localtime:/etc/localtime:ro
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- ./mail-data:/data
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```
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- 禁用反病毒功能(DISABLE_CLAMAV=TRUE)、禁用反垃圾邮件功能(DISABLE_RSPAMD=TRUE),可以大幅减低内存和CPU占用,请酌情设置禁用选项。
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- 禁用WEB收发功能(DISABLE_ROUNDCUBE=TRUE),可以进一步减少资源占用,不过非必要不建议禁止。
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- 8808为http端口,可以根据自己的需求修改。
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## Dns配置
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| 记录类型 | 主机记录 | 记录值 |
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|----------|----------|----------|
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| MX | your-domain.com | mail.your-domain.com |
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| TXT | your-domain.com | v=spf1 mx ~all |
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| A | mail | 1.2.3.4 (your ip) |
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| TXT | _dmarc | v=DMARC1; p=none; pct=100; rua=mailto:mail@your-domain.com |
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| CNAME | imap | mail |
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| CNAME | smtp | mail |
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| CNAME | pop | mail |
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| TXT | _s20160910378._domainkey.your-domain.com | k=rsa;p=MII......... |
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最后还需到 VPS 服务商处添加一个反向 DNS,也就是 rDNS 解析,把 IP 解析到 mail.your-domain.com 这个域名,有些 VPS 商家不提供这种服务,所以需要选择好VPS服务商。
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## 配置poste
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通过浏览器访问``https://mail.your-domain.com/admin/login``进入poste.io的配置页面,按照提示进行配置,然后点击 Generate new key,生成 key,添加到 DNS 解析记录,就是上面最后一条解析``_s20160910378._domainkey.your-domain.com``
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## 第三方客户端 SMTP/IMAP/POP3 配置
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搭建完毕之后我们也可以通过客户端软件连接到我们的邮箱,如thunderbird.
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| 协议 | 服务器地址 | 端口 | SSL |
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|------|------------|------|-----|
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| SMTP | mail.your-domain.com, smtp.your-domain.com | 25, 465, 587 | STARTTLS |
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| IMAP | mail.your-domain.com, imap.your-domain.com | 993, 143 | STARTTLS |
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| POP3 | mail.your-domain.com, pop.your-domain.com | 995, 110 | STARTTLS |
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---
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Done.
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