电子邮件附件解码_为什么我的电子邮件的大小大于其附件的大小？

偏执的太偏执、 2021-07-26 11:26 246阅读 0赞

![电子邮件附件 解码][a809c7228fc8eae7c8747dab1db39d7c.png]

电子邮件附件 解码

![why-is-the-size-of-my-email-larger-than-its-attached-files-00][]

If you are using a locally installed mail client, you may have noticed that the size of an email seems to be a bit larger than the files you have attached to it. Why is that and is it a cause for concern? Today’s SuperUser Q&A post has the answer to a confused reader’s question.

如果您使用的是本地安装的邮件客户端，则可能已经注意到，电子邮件的大小似乎比您所附加的文件大一些。 为什么会这样，这值得关注吗？ 今天的“超级用户问答”帖子回答了一个困惑的读者的问题。

*Today’s Question & Answer session comes to us courtesy of SuperUser—a subdivision of Stack Exchange, a community-driven grouping of Q&A web sites.*

*今天的“问答”环节由SuperUser提供，它是Stack Exchange的一个分支，该社区是由社区驱动的Q＆A网站分组。*

## 问题 **(**The Question**)** ##

SuperUser reader arc\_lupus wants to know why the size of his email is larger than its attached files:

超级用户阅读器arc\_lupus想知道为什么他的电子邮件的大小大于其附件的大小：

> When attaching files to email, I have noticed that Mozilla Thunderbird calculates the total size of the resulting email as much larger than the files I have attached.
> 
> 在将文件附加到电子邮件时，我注意到Mozilla Thunderbird计算出的结果电子邮件的总大小比我附加的文件大得多。
> 
> Here is a recent example: two images, one at 13 MB and the other at 3.6 MB, approximately 17 MB in total, and there were four lines of text. Mozilla Thunderbird then asked me if I really wanted to send an email with a total size of 22 MB.
> 
> 这是一个最近的示例：两张图像，一个图像为13 MB，另一图像为3.6 MB，总共约17 MB，并且有四行文本。 Mozilla Thunderbird然后问我是否真的要发送总大小为22 MB的电子邮件。
> 
> Where is that difference in size coming from? Having 5 MB of text sounds like a bit much.
> 
> 大小差异来自何处？ 拥有5 MB的文本听起来有点像。

Why would the size of an email be larger than its attached files?

为什么电子邮件的大小大于附件的大小？

## 答案 **(**The Answer**)** ##

SuperUser contributor David Schwartz has the answer for us:

超级用户贡献者David Schwartz为我们提供了答案：

> Your data was 17 MiB, there are 1024 KiB in a MiB, 1024 B in a KiB, and 8 bits in a byte. So that is a total of 142,606,336 bits.
> 
> 您的数据是17 MiB，MiB中有1024 KiB，KiB中有1024 B，字节中有8位。 因此，总共有142,606,336位。
> 
> Base 64 encoding encodes every 6 bits as a separate byte, so we need about 23,767,722 bytes. Dividing by 1024 twice gives us a total of 22.67 MiB. So that is where the 22 MiB comes from.
> 
> Base 64编码将每6位编码为一个单独的字节，因此我们需要约23767722个字节。 除以1024两次得到的总数为22.67 MiB。 这就是22 MiB的来源。
> 
> Email is a pretty old technology and does not assume an 8-bit clean pipe.
> 
> 电子邮件是一项相当古老的技术，并不假定使用8位纯净管道。

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Have something to add to the explanation? Sound off in the comments. Want to read more answers from other tech-savvy Stack Exchange users? [Check out the full discussion thread here][].

有什么补充说明吗？ 在评论中听起来不错。 是否想从其他精通Stack Exchange的用户那里获得更多答案？ [在此处查看完整的讨论线程][Check out the full discussion thread here] 。

> 翻译自: [https://www.howtogeek.com/278737/why-is-the-size-of-my-email-larger-than-its-attached-files/][https_www.howtogeek.com_278737_why-is-the-size-of-my-email-larger-than-its-attached-files]

电子邮件附件 解码

[a809c7228fc8eae7c8747dab1db39d7c.png]: /images/20210726/b38ab9931fea41a4a2ec82eec03368af.png
[why-is-the-size-of-my-email-larger-than-its-attached-files-00]: /images/20210726/3f7321f0cc5b488a827ad437b33673f6.png
[Check out the full discussion thread here]: http://superuser.com/questions/1139323/why-is-the-size-of-my-email-so-much-bigger-than-the-size-of-its-attached-files
[https_www.howtogeek.com_278737_why-is-the-size-of-my-email-larger-than-its-attached-files]: https://www.howtogeek.com/278737/why-is-the-size-of-my-email-larger-than-its-attached-files/