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Updates Email Recommendations, adds to disclaimer

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5_Privacy_Respecting_Software.md
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@ -197,11 +197,13 @@ Alternatively you could host your own catch-all email service. [Mailu](https://g
If you do not want to trust an email provider with your messages, you can host your own mail server. Without experience, this can be notoriously hard to correctly configure, especially when it comes to security. You may also find that cost, performance and features make it a less attractive option. If you do decide to go down this route, [Mail-in-a-box](https://mailinabox.email/), is an easy to deploy, open source mail server. It aims to promote decentralization, innovation, and privacy on the web, as well as have automated, auditable, and idempotent system configuration. Other ready-to-go self-hosted mail options include [Mailu](https://mailu.io/1.7/) and [Mail Cow](https://mailcow.email/), both of which are docker containers.
### Mail Clients
Email clients are the programs used to interact with the mail server. For hosted email, then the web and mobile clients provided by your email service are usually adequate, and may be the most secure option. For self-hosted email, you will need to install and configure mail clients for web, desktop or mobile.
Email clients are the programs used to interact with the mail server. For hosted email, then the web and mobile clients provided by your email service are usually adequate, and may be the most secure option. For self-hosted email, you will need to install and configure mail clients for web, desktop or mobile. A benefit of using an IMAP client, is that you will always have an offline backup of all email messages (which can then be encrypted and archived), and many applications let you aggregate multiple mailboxes for convenience.
- **Desktop** - [Mozilla Thunderbird](https://www.thunderbird.net) is an open source, highly customizable, secure and private desktop email client, for Windows, macOS, and Linux. If you are using ProtonMail, then you can use the [ProtonMail Bridge](https://protonmail.com/bridge/thunderbird), to sync your emails to either Thunderbird or Microsoft Outlook. In terms of security, the disadvantage, is that most desktop clients do not support 2FA, so it is important to keep your computer secured, however they are not vulnerable to the common browser attacks, that a web client would be.
- **Desktop** - [Mozilla Thunderbird](https://www.thunderbird.net) is an open source, long-standing and secure desktop email client by Mozilla, for Windows, macOS, and Linux. If you are using ProtonMail, then you can use the [ProtonMail Bridge](https://protonmail.com/bridge/thunderbird), to sync your emails to either Thunderbird or Microsoft Outlook. In terms of security, the disadvantage, is that most desktop clients do not support 2FA, so it is important to keep your computer secured, however they are not vulnerable to the common browser attacks, that a web client would be. See also [eM Client](https://www.emclient.com)m which is a reputable but proprietary paid desktop client for Windows and Mac OS.
- **Web** - If you are self-hosting your mail server, you will probably want a web-based email client. [RainLoop](http://www.rainloop.net) and [RoundCube](https://roundcube.net) are both good open source options.
- **Mobile** - the most secure option is usually to use the app provided by your mail provider. If your mail server is self-hosted, then consider [FairMail](https://email.faircode.eu/) which is a fully featured, open source, privacy oriented email app for Android. There is also [pretty Easy privacy p≡p](https://play.google.com/store/apps/details?id=security.pEp), which has OpenPGP built in. [K-9 Mail](https://play.google.com/store/apps/details?id=com.fsck.k9), which has been around almost as long as Android, has a solid reputation for privacy and security features.
- **Mobile** - the most secure option is usually to use the app provided by your mail provider. If your mail server is self-hosted, then consider [FairMail](https://email.faircode.eu/) which is a fully featured, open source, privacy oriented email app for Android. There is also [pretty Easy privacy p≡p](https://play.google.com/store/apps/details?id=security.pEp), which has OpenPGP built in, and [K-9 Mail](https://play.google.com/store/apps/details?id=com.fsck.k9), (which has been around almost as long as Android!), has a solid reputation for privacy and security features.
It is important to keep the device/ server running your mail client secure.
**See also** [Email Security Checklist](/README.md#emails)
@ -1026,12 +1028,16 @@ There is often a trade-off between convenience and security. Construct a threat
Open source software has long had a reputation of being more secure than its closed source counterparts. Since bugs are raised transparently, fixed quickly, the code can be checked by experts in the community and there is usually little or no data collection or analytics. That being said, there is no piece of software that it totally bug free, and hence never truly secure or private. Being open source, is in no way a guarantee that something is safe. There is no shortage of poorly-written, obsolete or sometimes plain malicious open source projects on the internet.
When using a hosted or managed application that is open-source software- there is often no easyily way to tell if the version running is the same as that of the published source code (even published signatures can be faked). There is always the possibility that additional backdoors may have been knowingly or unknowingly implemented in the running instance. One way round this is to self-host software yourself. When self-hosting you will then know for sure which code is running, however you will also be responsible for the managing security of the server, and so may not be recommended for beginners.
When using a hosted or property solution- always check the privacy policy, research the reputation of the organisation, and be weary about which data you trust them with. Where possible choose open source software for security-critical situations.
This list contains packages that range from entry-level to advanced, a lot of the software here will not be appropriate for all audiences.
It is in no way a definitive list of secure applications, and aims only to be a guide, a collection of software and services that myself and others have used, and would recommend. There will always be new vulnerabilities discovered or introduced, bugs and poorly configured systems. It is up to you to do your research, and decide where and how your data are managed.
If you find something on this list that should no longer be deemed secure, please raise an issue. In the same way if you know of something that is missing, or would like to make an edit, the pull requests are welcome, and are much appreiciated!
### Contributing