Merge pull request #4821 from geekpi/master

translated

translated/tech/20161215 Building an Email Server on Ubuntu Linux - Part 2.md

@@ -1,4 +1,4 @@
-在Ubuntu上构建一台Email服务器（二）
+在Ubuntu上搭建一台Email服务器（二）
 ============================================================
 
 ### [dovecot-email.jpg][4]

translated/tech/20161215 Building an Email Server on Ubuntu Linux - Part 3.md

@@ -1,24 +1,23 @@
-translating---geekpi
-
-Building an Email Server on Ubuntu Linux, Part 3
+在Ubuntu上搭建一台Email服务器（四）
 ============================================================
 
 ### [mail-server.jpg][2]
 
  ![Mail server](https://www.linux.com/sites/lcom/files/styles/rendered_file/public/mail-server.jpg?itok=Ox1SCDsV "Mail server") 
-In the final part of this tutorial series, we go into detail on how to set up virtual users and mailboxes in Dovecot and Postfix.[Creative Commons Zero][1]pixabay
+本系列的第四部分我们将详细介绍在Dovecot和Postfix中设置虚拟用户。以[Creative Commons Zero][2]Pixabay方式授权发布
 
-Welcome back, me hearty Linux syadmins! In [part 1][3] and [part 2][4] of this series, we learned to how to put Postfix and Dovecot together to make a nice IMAP and POP3 mail server. Now we will learn to make virtual users so that we can manage all of our users in Dovecot.
+欢迎回来，我热心的Linux系统管理员们！ 在本系列的[第一部分][3]和[第二部分][4]中，我们学习了如何将Postfix和Dovecot组合在一起，搭建一个不错的IMAP和POP3邮件服务器。 现在我们将学习设置虚拟用户，以便我们可以管理所有在Dovecot中的用户。
 
-### Sorry, No SSL. Yet.
+### 抱歉还不能配置SSL
 
-I know I promised to show you how to set up a proper SSL-protected server. Unfortunately, I underestimated how large that topic is. So, I will realio trulio write a comprehensive how-to by next month.
+我知道我答应教你们如何设置一个正确的受SSL保护的服务器。 不幸的是，我低估了这个话题的范围。 所以，我会下个月再写一个全面的教程。
 
-For today, in this final part of this series, we'll go into detail on how to set up virtual users and mailboxes in Dovecot and Postfix. It's a bit weird to wrap your mind around, so the following examples are as simple as I can make them. We'll use plain flat files and plain-text authentication. You have the options of using database back ends and nice strong forms of encrypted authentication; see the links at the end for more information on these.
+对于今天，在本系列的最后一部分中，我们将详细介绍如何在Dovecot和Postfix中设置虚拟用户和邮箱。 在你看来这是有点奇怪，所以我尽量让下面的例子是简单点。我们将使用纯文件和纯文本来进行身份验证。 你也可以选择使用数据库后端和很好的加密认证形式，具体请参阅文末链接了解有关这些的更多信息。
 
-### Virtual Users
+### 虚拟用户
 
 You want virtual users on your email server and not Linux system users. Using Linux system users does not scale, and it exposes their logins, and your Linux server, to unnecessary risk. Setting up virtual users requires editing configuration files in both Postfix and Dovecot. We'll start with Postfix. First, we'll start with a clean, simplified `/etc/postfix/main.cf`. Move your original `main.cf` out of the way and create a new clean one with these contents:
+你希望电子邮件服务器上的是虚拟用户而不是Linux系统用户。使用Linux系统用户不能扩展，并且它们会暴露登录账号以及会给你的服务器带来不必要的风险。 设置虚拟用户需要在Postfix和Dovecot中编辑配置文件。我们将从Postfix开始。首先，我们将从一个干净、简单的`/etc /postfix/main.cf`开始。移动你原始的`main.cf`到别处，创建一个新的干净的文件：
 
 ```
 
@@ -45,9 +44,9 @@ virtual_gid_maps = static:5000
 virtual_transport = lmtp:unix:private/dovecot-lmtp0
 ```
 
-You may copy this exactly, except for the `192.168.0.0/24` parameter for `mynetworks`, as this should reflect your own local subnet.
+你或许可以直接拷贝这份文件除了`mynetworks`的参数`192.168.0.0/24`，它反映了你的本地子网掩码。
 
-Next, create the user and group `vmail`, which will own your virtual mailboxes. The virtual mailboxes are stored in `vmail's` home directory.
+接下来，创建用户和组`vmail`，它会拥有你的虚拟邮箱。虚拟邮箱存在 `vmail`的家目录下。
 
 ```
 
@@ -55,7 +54,7 @@ $ sudo groupadd -g 5000 vmail
 $ sudo useradd -m -u 5000 -g 5000 -s /bin/bash vmail
 ```
 
-Then reload the Postfix configurations:
+接下来重新加载Postfix配置：
 
 ```
 
@@ -64,16 +63,16 @@ $ sudo postfix reload
 postfix/postfix-script: refreshing the Postfix mail system
 ```
 
-### Dovecot Virtual Users
+### Dovecot虚拟用户
 
-We'll use Dovecot's `lmtp` protocol to connect it to Postfix. You probably need to install it:
+我们会使用Dovecot的`lmtp`协议来连接到Postfix。你可以这样安装：
 
 ```
 
 $ sudo apt-get install dovecot-lmtpd
 ```
 
-The last line in our example `main.cf` references `lmtp`. Copy this example `/etc/dovecot/dovecot.conf`, replacing your existing file. Again, we are using just this single file, rather than calling the files in `/etc/dovecot/conf.d`.
+`main.cf`的最后一行参考`lmtp`。复制这个例子`/etc/dovecot/dovecot.conf`来替换已存在的文件。再说一次，我们只使用这个文件，而不是`/etc/dovecot/conf.d`内的所有文件。
 
 ```
 
@@ -113,7 +112,7 @@ service lmtp {
 }
 ```
 
-At last, you can create the file that holds your users and passwords, `/etc/dovecot/passwd`. For simple plain text authorization we need only our users' full email addresses and passwords:
+最后，你快可以创建一个含有用户和密码的文件 `/etc/dovecot/passwd`。对于纯文本验证，我们只需要用户的完整邮箱地址和密码：
 
 ```
 
@@ -124,7 +123,7 @@ molly@studio:{PLAIN}password
 benny@studio:{PLAIN}password
 ```
 
-The Dovecot virtual users are independent of the Postfix virtual users, so you will manage your users in Dovecot. Save all of your changes and restart Postfix and Dovecot:
+Dovecot虚拟用户独立于Postfix虚拟用户，因此你需要管理Dovecot中的用户。保存所有的设置并重启Postfix和Dovecot：
 
 ```
 
@@ -132,7 +131,7 @@ $ sudo service postfix restart
 $ sudo service dovecot restart
 ```
 
-Now let's use good old telnet to see if Dovecot is set up correctly.
+现在让我们使用较旧的telnet来看下Dovecot是否设置正确了。
 
 ```
 
@@ -150,7 +149,7 @@ quit
 Connection closed by foreign host.
 ```
 
-So far so good! Now let's send some test messages to our users with the `mail` command. Make sure to use the whole user's email address and not just the username.
+现在一切都好！让我们用`mail`测试发送消息给我们的用户。确保使用用户的电子邮箱地址而不只是用户名。
 
 ```
 
@@ -160,7 +159,7 @@ Please enjoy your new mail account!
 .
 ```
 
-The period on the last line sends your message. Let's see if it landed in the correct mailbox.
+最后一行的点是发送消息。让我们看下它是否到达了正确的邮箱。
 
 ```
 
@@ -171,7 +170,7 @@ drwx------ 5 vmail vmail 4096 Dec 14 12:39 ..
 -rw------- 1 vmail vmail  525 Dec 14 12:39 1481747995.M696591P5790.studio,S=525,W=540
 ```
 
-And there it is. It is a plain text file that we can read:
+找到了。这是一封我们可以阅读的纯文本文件：
 
 ```
 $ less 1481747995.M696591P5790.studio,S=525,W=540
@@ -192,22 +191,22 @@ From: carla@localhost (carla)
 Please enjoy your new mail account!
 ```
 
-You could also use telnet for testing, as in the previous segments of this series, and set up accounts in your favorite mail client, such as Thunderbird, Claws-Mail, or KMail.
+你还可以使用telnet进行测试，如本系列前面部分所述，并在你最喜欢的邮件客户端中设置帐户，如Thunderbird，Claws-Mail或KMail。
 
-### Troubleshooting
+### 故障排查
 
-When things don't work, check your logfiles (see the configuration examples), and run `journalctl -xe`. This should give you all the information you need to spot typos, uninstalled packages, and nice search terms for Google.
+当它不工作时，请检查日志文件（请参阅配置示例），然后运行`journalctl -xe`。 这时应该就会给你提供输入错误、已卸载的包和可以谷歌的字词了。
 
-### What Next?
+### 接下来？
 
-Assuming your LAN name services are correctly configured, you now have a nice usable LAN mail server. Obviously, sending messages in plain text is not optimal, and an absolute no-no for Internet mail. See [Dovecot SSL configuration][5] and [Postfix TLS Support][6]. [VirtualUserFlatFilesPostfix][7] covers TLS and database back ends. And watch for my upcoming SSL how-to. Really.
+假设你的LAN名称服务配置正确，你现在有一台很好用的LAN邮件服务器。 显然以纯文本发送消息不是最佳的，并且对于Internet邮件也是绝对否定的。 请参阅[Dovecot SSL配置][5]和[Postfix TLS支持][6]。 [VirtualUserFlatFilesPostfix][7]涵盖TLS和数据库后端。并记得看即将到来的SSL指南。这次我说的是真的。
 
 --------------------------------------------------------------------------------
 
 via: https://www.linux.com/learn/sysadmin/building-email-server-ubuntu-linux-part-3
 
 作者：[ CARLA SCHRODER][a]
-译者：[译者ID](https://github.com/译者ID)
+译者：[geekpi](https://github.com/geekpi)
 校对：[校对者ID](https://github.com/校对者ID)
 
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