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[zianglei翻译中]
4 open source Android email clients
======
Email is not on its deathbed, but most of it happens on mobile devices now.
![](https://opensource.com/sites/default/files/styles/image-full-size/public/lead-images/email_mail_box_envelope_send_blue.jpg?itok=6Epj47H6)
Even though members of the younger generations are trying to bury email as "communication for old people," the reality is email isn't anywhere near its deathbed. While [collaboration tools][1], social media, and texting are important, they aren't ready to replace email as an essential business (and social) communications tool.
Given that email isn't going away and most of it is now read on mobile devices (according to a host of studies), having a good mobile email client is critical. If you're an Android user who wants an open source email client, things get a little bit tricky.
We've uncovered four open source email clients for Android for you to consider. Two are available in the official Android app store, [Google Play][2] , and you can find them in one of the open source Android app repositories, [Fossdroid][3] or [F-Droid][4] . (See below for specific download details for each.)
### K-9 Mail
[K-9 Mail][5] has been around almost as long as Android has—it originated out of a patch to the Android 1.0 email client. It has support for IMAP and WebDAV, multiple identities, attachments, emojis, and other typical email client features. Its [user documentation][6] offers help on installation, setup, security, reading and sending email, and much more.
K-9 is open sourced under the [Apache 2.0][7] License with [source code][8] available on GitHub. It's available for download on [Google Play][9], [Amazon][10], and [F-Droid][11].
### p≡p
As its full name, "Pretty Easy Privacy" suggests, [p≡p][12] is focused on privacy and secure communications. It provides automatic, end-to-end encryption of emails and attachments (provided your recipient also has an encryption solution installed—if not, p≡p warns that your email will be sent without encryption).
You can access the [source code][13] (licensed under [GPLv3][14]) from GitLab and find [documentation][15] on the app's website. Download p≡p for free on [Fossdroid][16] or for a nominal fee on [Google Play][17].
### InboxPager
[InboxPager][18] allows you to send and read email messages over the SSL/TLS protocol, which means you may need to do some tweaking if your email provider (e.g., Gmail) doesn't turn that on by default. (Fortunately, InboxPager offers Gmail [instructions][19].) It also supports OpenPGP encryption through the OpenKeychain application.
InboxPager is licensed under [GPLv3][20] with [source code][18] available on GitHub, and it can be installed via [F-Droid][21].
### FairEmail
[FairEmail][22] takes a minimalistic approach to mobile email, focusing on reading and writing messages—without all the bells and whistles that risk slowing your email client. It supports multiple accounts and identities, message threading, encryption, and more.
It's licensed under [GPLv3][23] with [source code][24] available on GitHub. You can download FairEmail on [Fossdroid][25]; a Google Play version is available for people interested in [testing the software][26].
There's certainly room for other entries into the open source Android email client space (or for improving the ones above)—motivated developers, take notice. And, if you know of an application we missed, please share it in the comments.
--------------------------------------------------------------------------------
via: https://opensource.com/article/18/10/open-source-android-email-clients
作者:[Opensource.com][a]
选题:[lujun9972][b]
译者:[译者ID](https://github.com/译者ID)
校对:[校对者ID](https://github.com/校对者ID)
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译,[Linux中国](https://linux.cn/) 荣誉推出
[a]: https://opensource.com
[b]: https://github.com/lujun9972
[1]: https://opensource.com/alternatives/trello
[2]: https://play.google.com/store
[3]: https://fossdroid.com/
[4]: https://f-droid.org/
[5]: https://k9mail.github.io/
[6]: https://k9mail.github.io/documentation.html
[7]: http://www.apache.org/licenses/LICENSE-2.0
[8]: https://github.com/k9mail/k-9
[9]: https://play.google.com/store/apps/details?id=com.fsck.k9
[10]: https://www.amazon.com/K-9-Dog-Walkers-Mail/dp/B004JK61K0/
[11]: https://f-droid.org/packages/com.fsck.k9/
[12]: https://www.pep.security/android.html.en
[13]: https://pep-security.lu/gitlab/android/pep
[14]: https://pep-security.lu/gitlab/android/pep/blob/feature/material/LICENSE
[15]: https://www.pep.security/docs/
[16]: https://fossdroid.com/a/p%E2%89%A1p.html
[17]: https://play.google.com/store/apps/details?id=security.pEp
[18]: https://github.com/itprojects/InboxPager
[19]: https://github.com/itprojects/InboxPager/blob/HEAD/README.md#gmail-configuration
[20]: https://github.com/itprojects/InboxPager/blob/c5641a6d644d001bd4cec520b5a96d7e588cb6ad/LICENSE
[21]: https://f-droid.org/en/packages/net.inbox.pager/
[22]: https://email.faircode.eu/
[23]: https://github.com/M66B/open-source-email/blob/master/LICENSE
[24]: https://github.com/M66B/open-source-email
[25]: https://fossdroid.com/a/fairemail.html
[26]: https://play.google.com/apps/testing/eu.faircode.email

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四个开源的Android邮件客户端
======
Email 现在还没有绝迹,而且现在大部分邮件都来自于移动设备。
![](https://opensource.com/sites/default/files/styles/image-full-size/public/lead-images/email_mail_box_envelope_send_blue.jpg?itok=6Epj47H6)
现在一些年轻人正将邮件称之为“老年人的交流方式”,然而事实却是邮件绝对还没有消亡。虽然[协作工具][1],社交媒体,和短信很常用,但是它们还没做好取代邮件这种必要的商业(和社交)通信工具。
考虑到邮件还没有消失,并且(很多研究表明)人们都是在移动设备上阅读邮件,拥有一个好的移动邮件客户端就变得很关键。如果你是一个想使用开源的邮件客户端的 Android 用户,事情就变得有点棘手了。
我们提供了四个开源的 Andorid 邮件客户端供选择。其中两个可以通过 Andorid 官方应用商店 [Google Play][2] 下载。你也可以在 [Fossdroid][3] 或者 [F-Droid][4] 这些开源 Android 应用库中找到他们。(下方有每个应用的具体下载方式。)
### K-9 Mail
[K-9 Mail][5] 拥有几乎和 Android 一样长的历史——它起源于 Android 1.0 邮件客户端的一个补丁。它支持 IMAP 和 WebDAV、多用户、附件、emojis 和其他经典的邮件客户端功能。它的[用户文档][6]提供了关于安装、启动、安全、阅读和发送邮件等等的帮助。
K-9 基于 [Apache 2.0][7] 协议开源,[源码][8]可以从 GitHub 上获得. 应用可以从 [Google Play][9]、[Amazon][10] 和 [F-Droid][11] 上下载。
### p≡p
正如它的全称”Pretty Easy Privacy”说的那样[p≡p][12] 主要关注于隐私和安全通信。它提供自动的、端到端的邮件和附件加密但要求你的收件人也要能够加密邮件——否则p≡p会警告你的邮件将不加密发出
你可以从 GitLab 获得[源码][13](基于 [GPLv3][14] 协议),并且可以从应用的官网上找到相应的[文档][15]。应用可以在 [Fossdroid][16] 上免费下载或者在 [Google Play][17] 上支付一点儿象征性的费用下载。
### InboxPager
[InboxPager][18] 允许你通过 SSL/TLS 协议收发邮件信息,这也表明如果你的邮件提供商(比如 Gmail )没有默认开启这个功能的话,你可能要做一些设置。(幸运的是, InboxPager 提供了 Gmail的[设置教程][19]。)它同时也支持通过 OpenKeychain 应用进行 OpenPGP 机密。
InboxPager 基于 [GPLv3][20] 协议,其源码可从 GitHub 获得,并且应用可以从 [F-Droid][21] 下载。
### FairEmail
[FairEmail][22] 是一个极简的邮件客户端,它的功能集中于读写信息,没有任何多余的可能拖慢客户端的功能。它支持多个帐号和用户,消息线程,加密等等。
它基于 [GPLv3][23] 协议开源,[源码][24]可以从GitHub上获得。你可以在 [Fossdroid][25] 上下载 FairEamil 对 Google Play 版本感兴趣的人可以从 [testing the software][26] 获得应用。
肯定还有更多的开源 Android 客户端(或者上述软件的加强版本)——活跃的开发者们可以关注一下。如果你知道还有哪些优秀的应用,可以在评论里和我们分享。
--------------------------------------------------------------------------------
via: https://opensource.com/article/18/10/open-source-android-email-clients
作者:[Opensource.com][a]
选题:[lujun9972][b]
译者:[zianglei][c]
校对:[校对者ID](https://github.com/校对者ID)
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译,[Linux中国](https://linux.cn/) 荣誉推出
[a]: https://opensource.com
[b]: https://github.com/lujun9972
[c]: https://github.com/zianglei
[1]: https://opensource.com/alternatives/trello
[2]: https://play.google.com/store
[3]: https://fossdroid.com/
[4]: https://f-droid.org/
[5]: https://k9mail.github.io/
[6]: https://k9mail.github.io/documentation.html
[7]: http://www.apache.org/licenses/LICENSE-2.0
[8]: https://github.com/k9mail/k-9
[9]: https://play.google.com/store/apps/details?id=com.fsck.k9
[10]: https://www.amazon.com/K-9-Dog-Walkers-Mail/dp/B004JK61K0/
[11]: https://f-droid.org/packages/com.fsck.k9/
[12]: https://www.pep.security/android.html.en
[13]: https://pep-security.lu/gitlab/android/pep
[14]: https://pep-security.lu/gitlab/android/pep/blob/feature/material/LICENSE
[15]: https://www.pep.security/docs/
[16]: https://fossdroid.com/a/p%E2%89%A1p.html
[17]: https://play.google.com/store/apps/details?id=security.pEp
[18]: https://github.com/itprojects/InboxPager
[19]: https://github.com/itprojects/InboxPager/blob/HEAD/README.md#gmail-configuration
[20]: https://github.com/itprojects/InboxPager/blob/c5641a6d644d001bd4cec520b5a96d7e588cb6ad/LICENSE
[21]: https://f-droid.org/en/packages/net.inbox.pager/
[22]: https://email.faircode.eu/
[23]: https://github.com/M66B/open-source-email/blob/master/LICENSE
[24]: https://github.com/M66B/open-source-email
[25]: https://fossdroid.com/a/fairemail.html
[26]: https://play.google.com/apps/testing/eu.faircode.email