> For the complete documentation index, see [llms.txt](https://book.bsdcn.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://book.bsdcn.org/handbook/di-32-zhang-dian-zi-you-jian/32.3.-dma.md).

# 32.3.DragonFly 邮件代理（DMA）

DragonFly Mail Agent (DMA) 是从 FreeBSD 版本 14.0 开始的默认 MTA。[dma(8)](https://man.freebsd.org/cgi/man.cgi?query=dma\&sektion=8\&format=html) 是小型的邮件传输代理（MTA），设计用于家庭和办公室使用。它接受来自本地安装的邮件用户代理（MUA）的邮件，并将邮件传递到本地或远程目的地。远程传递包括多个功能，如 TLS/SSL 支持和 SMTP 身份验证。

[dma(8)](https://man.freebsd.org/cgi/man.cgi?query=dma\&sektion=8\&format=html) 并不打算取代真正的大型 MTA，如 [sendmail(8)](https://man.freebsd.org/cgi/man.cgi?query=sendmail\&sektion=8\&format=html) 或 [postfix(1)](https://man.freebsd.org/cgi/man.cgi?query=postfix\&sektion=1\&format=html)。因此，[dma(8)](https://man.freebsd.org/cgi/man.cgi?query=dma\&sektion=8\&format=html) 不会在端口 25 上监听传入连接。

## 32.3.1. 配置 DragonFly Mail Agent (DMA)

DMA 提供默认配置，适合许多部署。自定义设置可以在 **/etc/dma/dma.conf** 中定义，SMTP 身份验证配置在 **/etc/dma/auth.conf** 中。

### 32.3.1.1. 使用 DMA 通过 Gmail 路由传出邮件（STARTTLS:SMTP 示例）

示例 **/etc/dma/dma.conf** 可用于通过 Google 的 SMTP 服务器发送邮件。

```ini
SMARTHOST smtp.gmail.com
PORT 587
AUTHPATH /etc/dma/auth.conf
SECURETRANSFER
STARTTLS
MASQUERADE username@gmail.com
```

在 **/etc/dma/auth.conf** 中添加一行即可设置身份验证：

```ini
username@gmail.com|smtp.gmail.com:password
```

> **注意**
>
> 启用双重身份验证后，你需要生成应用专用密码，因为普通登录密码会被拒绝。有关 [应用专用密码](https://myaccount.google.com/apppasswords) 的更多信息，请参阅 Google 文档。

执行以下命令以测试配置：

```sh
% echo this is a test | mail -v -s testing-email username@gmail.com
```

### 32.3.1.2. 使用 DMA 通过 Fastmail 路由传出邮件（SSL/TLS 示例）

示例 **/etc/dma/dma.conf** 可用于通过 Fastmail 的 SMTP 服务器发送邮件。

```ini
SMARTHOST smtp.fastmail.com
PORT 465
AUTHPATH /etc/dma/auth.conf
SECURETRANSFER
MAILNAME example.server.com
```

在 **/etc/dma/auth.conf** 中添加一行即可设置身份验证：

```ini
username@fastmail.com|smtp.fastmail.com:password
```

执行以下命令以测试配置：

```sh
% echo this is a test | mail -v -s testing-email username@fastmail.com
```

### 32.3.1.3. 使用 DMA 通过自定义邮件主机路由传出邮件

示例 **/etc/dma/dma.conf** 可用于通过自定义邮件主机发送邮件。

```ini
SMARTHOST mail.example.org
PORT 587
AUTHPATH /etc/dma/auth.conf
SECURETRANSFER
STARTTLS
```

在 **/etc/dma/auth.conf** 中添加一行即可设置身份验证：

```ini
username@example.org|mail.example.org:password
```

执行以下命令以测试配置：

```sh
% echo this is a test | mail -v -s testing-email username@example.org
```


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