Ubuntu邮件服务器怎样配置DKIM签名

在Ubuntu上配置DKIM（DomainKeys Identified Mail）签名可以帮助提高邮件的安全性和可信度。以下是一个基本的步骤指南，帮助你在Ubuntu上配置DKIM签名：

1. 安装DKIM签名工具

首先，你需要安装一个DKIM签名工具，比如opendkim。

sudo apt update
sudo apt install opendkim opendkim-tools

2. 生成DKIM密钥对

使用opendkim-genkey命令生成DKIM密钥对。

sudo opendkim-genkey -t -s mail -d yourdomain.com

• -t：生成测试密钥。
• -s：指定选择器名称（例如mail）。
• -d：指定域名（例如yourdomain.com）。

这将在/etc/opendkim/keys/yourdomain.com/mail.private生成私钥，在/etc/opendkim/keys/yourdomain.com/mail.txt生成公钥。

3. 配置OpenDKIM

编辑OpenDKIM的配置文件/etc/opendkim.conf。

sudo nano /etc/opendkim.conf

添加或修改以下配置：

Domain yourdomain.com
Selector mail
PrivateKey /etc/opendkim/keys/yourdomain.com/mail.private

4. 配置DNS记录

在DNS管理界面中添加一个TXT记录，用于验证DKIM签名。

• 主机记录：mail._domainkey
• 记录类型：TXT
• 记录值：v=DKIM1; k=rsa; p=YOUR_PUBLIC_KEY

例如：

v=DKIM1; k=rsa; p=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