ubuntu邮件服务器DKIM签名设置

在Ubuntu上设置邮件服务器的DKIM（DomainKeys Identified Mail）签名可以帮助提高邮件的可信度和防止伪造。以下是一个基本的步骤指南，使用opendkim和opendkim-tools来设置DKIM签名。

1. 安装必要的软件包

首先，更新你的包列表并安装opendkim和opendkim-tools：

sudo apt update
sudo apt install opendkim opendkim-tools

2. 配置OpenDKIM

生成密钥对

你需要为你的域名生成一个DKIM密钥对。可以使用以下命令生成：

sudo opendkim-genkey -t -s mail -d 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。

配置OpenDKIM

编辑OpenDKIM的主配置文件/etc/opendkim.conf，进行如下配置：

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

配置DNS记录

你需要在你的DNS提供商处添加一个TXT记录，以便邮件接收方可以验证DKIM签名。TXT记录的内容应该是：

selector._domainkey IN TXT "v=DKIM1; k=rsa; p=YOUR_PUBLIC_KEY"

将selector替换为你在opendkim.conf中配置的Selector值，将YOUR_PUBLIC_KEY替换为/etc/opendkim/keys/yourdomain.com/mail.txt文件中的内容。

例如：

mail._domainkey IN TXT "v=DKIM1; k=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQC8kGa1pSjbSYZVebtTRBLxBz5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lFJy9z5H4I6tj6hV7y2wVbEeJm5lF

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