毕业论文代写-Qmail和Sendmail配置文件的不同

毕业论文代写-Qmail和Sendmail配置文件的不同。Qmail和Sendmail配置文件是完全不同的(Hafiz & Johnson, 2008)。Qmail有自己的配置文件，配置目录包含5-30个不同的文件，每个文件对应不同的配置部分(如虚拟域、虚拟主机等)。这个配置在man中有很好的文档，但是Qmail的代码结构不是很好。Qmail比Sendmail小得多，与今天的邮件服务器相比，它缺少一些功能。例如，Qmail不需要验证邮件发送者的域名以确保域名的准确性。Qmail本身不支持RBL，需要插件才能实现。但是Sendmail支持RBL。Qmail最大的问题是在处理过程中向多个接收者发送消息。如果用户向同一域中的多个用户发送一条大消息，Sendmail将只向邮件服务器发送一个副本。Qmail并行连接时间，每次向用户发送一个副本。如果用户想要向多个用户发送大量的每日邮件，使用Qmail会浪费大量带宽。可以看出，Sendmail节省了带宽资源，Qmail节省了时间。接下来毕业论文代写-Qmail和Sendmail配置文件的不同分享给留学生阅读。

Qmail is another choice has the special consideration in the design and implementation of safety issues. If user needs a quick solution such as a secure mail gateway, then Qmail is a good choice. Qmail and Sendmail configuration files are completely different (Hafiz & Johnson, 2008). As for Qmail, it has its own configuration file and the configuration directory contains 5-30 different files, each file for the different parts of the configuration (such as virtual domain or virtual host etc.). This configuration has a very good document in man, but the code structure of Qmail is not good.

Qmail is much smaller than Sendmail, it lacks some features compared to today’s mail server. For example, Qmail does not require verification of the mail sender’s domain to ensure the accuracy of the domain name. Qmail Itself does not provide support for RBL and need add-on to achieve. But Sendmail support RBL. The biggest problem of Qmail lies in sending messages to multiple receivers on processing. If user sends a big message to multiple users in the same domain, Sendmail will only send to mail a copy to the mail server. Qmail parallel connection times, each time it sends a copy to a user. If the user wants to send a large daily mail to multiple users, the use of Qmail will waste a lot of bandwidth. It can be concluded that Sendmail save the bandwidth resource and Qmail save time.

The source code of Qmail compared to Sendmail is easier to understand, which a virtue of less experience MTA staff is. Qmail is stable in terms of safety and it has good technical support, but not like the Sendmail is widely used. Moreover, Qmail is not installed like Sendmail automation, needs manual steps.

Qmail has less add-on than Sendmail. In general, for less experienced administrator, Qmail is relatively better choice. Sendmail is similar to the office suite, and the 80% functions are not used. This makes Qmail may be more popular in some places, it has some popular and practical features, such as built-in POP3 support. Qmail supports such as host or user disguise, virtual domains and so on. The simplicity of Qmail also makes the configuration is relatively easy.

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