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Skiff Mail added WKD/OpenPGP support (#2353)
Signed-off-by: Freddy <freddy@privacyguides.org> Signed-off-by: Daniel Gray <dngray@privacyguides.org>
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Jonah Aragon
Daniel Gray
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116
docs/email.md
116
docs/email.md
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@ -23,13 +23,14 @@ These providers natively support OpenPGP encryption/decryption and the [Web Key
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<div class="grid cards" markdown>
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- { .twemoji } [Proton Mail](email.md#proton-mail)
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- { .twemoji } [Skiff Mail](email.md#skiff-mail)
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- { .twemoji } [Mailbox.org](email.md#mailboxorg)
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</div>
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!!! warning
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When using E2EE technology like OpenPGP, email will still have some metadata that is not encrypted in the header of the email. Read more about [email metadata](basics/email-security.md#email-metadata-overview).
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When using E2EE technology like OpenPGP your email will still have some metadata that is not encrypted in the header of the email, generally including the subject line! Read more about [email metadata](basics/email-security.md#email-metadata-overview).
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OpenPGP also does not support Forward secrecy, which means if either your or the recipient's private key is ever stolen, all previous messages encrypted with it will be exposed. [How do I protect my private keys?](basics/email-security.md#how-do-i-protect-my-private-keys)
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@ -83,9 +84,9 @@ Certain information stored in [Proton Contacts](https://proton.me/support/proton
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#### :material-check:{ .pg-green } Email Encryption
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Proton Mail has [integrated OpenPGP encryption](https://proton.me/support/how-to-use-pgp) in their webmail. Emails to other Proton Mail accounts are encrypted automatically, and encryption to non-Proton Mail addresses with an OpenPGP key can be enabled easily in your account settings. They also allow you to [encrypt messages to non-Proton Mail addresses](https://proton.me/support/password-protected-emails) without the need for them to sign up for a Proton Mail account or use software like OpenPGP.
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Proton Mail has [integrated OpenPGP encryption](https://proton.me/support/how-to-use-pgp) in their webmail. Emails to other Proton Mail accounts are encrypted automatically, and encryption to non-Proton Mail addresses with an OpenPGP key can be enabled easily in your account settings. Proton also supports automatic external key discovery with [Web Key Directory (WKD)](https://wiki.gnupg.org/WKD). This means that emails sent to other providers which use WKD, such as Skiff Mail, will be automatically encrypted with OpenPGP as well, without the need to manually exchange public PGP keys with your contacts. They also allow you to [encrypt messages to non-Proton Mail addresses without OpenPGP](https://proton.me/support/password-protected-emails), without the need for them to sign up for a Proton Mail account.
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Proton Mail also supports the discovery of public keys via HTTP from their [Web Key Directory (WKD)](https://wiki.gnupg.org/WKD). This allows people who don't use Proton Mail to find the OpenPGP keys of Proton Mail accounts easily, for cross-provider E2EE. This only applies to email addresses ending in one of Proton's own domains, like @proton.me. If you use a custom domain, you must [configure WKD](./basics/email-security.md#what-is-the-web-key-directory-standard) separately.
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Proton Mail also publishes the public keys of Proton accounts via HTTP from their WKD. This allows people who don't use Proton Mail to find the OpenPGP keys of Proton Mail accounts easily, for cross-provider E2EE. This only applies to email addresses ending in one of Proton's own domains, like @proton.me. If you use a custom domain, you must [configure WKD](./basics/email-security.md#what-is-the-web-key-directory-standard) separately.
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#### :material-information-outline:{ .pg-blue } Account Termination
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@ -97,6 +98,61 @@ Proton Mail offers an "Unlimited" account for €9.99/Month, which also enables
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Proton Mail doesn't offer a digital legacy feature.
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### Skiff Mail
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!!! recommendation
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{ align=right }
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**Skiff Mail** is a web based email service with E2EE that began in 2020 that is based in San Francisco with developers worldwide. Accounts start with 10GB of free storage.
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[:octicons-home-16: Homepage](https://skiff.com/mail){ .md-button .md-button--primary }
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[:octicons-eye-16:](https://app.skiff.com/docs/db93c237-84c2-4b2b-9588-19a7cd2cd45a#tyGksN9rkqbo2uGYASxsA6HVLjUoly/wTYK8tncTto8=){ .card-link title="Privacy Policy" }
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[:octicons-info-16:](https://skiff.com/help){ .card-link title=Documentation}
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[:octicons-code-16:](https://github.com/skiff-org/skiff-apps){ .card-link title="Source Code" }
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??? downloads
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- [:simple-android: Android](https://play.google.com/store/apps/details?id=com.skemailmobileapp&pli=1)
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- [:simple-appstore: iOS](https://apps.apple.com/us/app/skiff-mail/id1619168801)
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- [:octicons-browser-16: Web](https://app.skiff.com/mail)
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Skiff has undergone a few [audits](https://skiff.com/transparency) during its development.
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#### :material-check:{ .pg-green } Custom Domains and Aliases
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You can create up to 3 additional @skiff.com email aliases in addition to your primary account address on their free plan. Free accounts can add 1 [custom domain](https://skiff.com/blog/custom-domain-setup), and up to 15 custom domains on a paid plan. You can create unlimited aliases or a [catch-all](https://skiff.com/blog/catch-all-email-alias) alias on your custom domain.
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#### :material-alert-outline:{ .pg-orange } Private Payment Methods
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Skiff Mail accepts cryptocurrency payments via Coinbase Commerce, including Bitcoin and Ethereum, but they do not accept our recommended [cryptocurrency](cryptocurrency.md), Monero. They also accept credit card payments via Stripe.
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#### :material-check:{ .pg-green } Account Security
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Skiff Mail supports TOTP two-factor authentication and hardware security keys using FIDO2 or U2F standards. The use of a hardware security key requires setting up TOTP two-factor authentication first.
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#### :material-check:{ .pg-green } Data Security
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Skiff Mail has zero access encryption at rest for all of your data. This means the messages and other data stored in your account are only readable by you.
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#### :material-check:{ .pg-green } Email Encryption
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Skiff Mail encrypts messages to other Skiff mailboxes automatically with E2EE. On December 18th, 2023, Skiff added support for PGP and automatic public key discovery via Web Key Directory (WKD). This means that emails sent to other providers which use WKD, such as Proton Mail, will be automatically encrypted with OpenPGP as well without the need to exchange public PGP keys with your contacts. New Skiff Mail accounts should have a PGP key automatically generated, while accounts from before this feature was introduced need to generate a new PGP key for their address (or upload an existing private key) in the account's address settings. Skiff Mail only has support for reading messages encrypted with PGP/MIME, not the older PGP/Inline standard. Sending messages with PGP/MIME is the [recommended approach](https://www.gnupg.org/faq/gnupg-faq.html#use_pgpmime), but may pose compatibility issues in some edge cases.
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Skiff Mail also publishes the public keys of Skiff Mail accounts via HTTP from their [Web Key Directory (WKD)](https://wiki.gnupg.org/WKD). This allows people who don't use Skiff Mail to find the OpenPGP keys of Skiff Mail accounts easily, for cross-provider E2EE. This only applies to email addresses ending in one of Skiff's own domains, like @skiff.com. If you use a custom domain, you must [configure WKD](./basics/email-security.md#what-is-the-web-key-directory-standard) separately.
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Skiff does not have a "temporary inbox" or "passworded email" feature like some other providers have, so that external users without OpenPGP cannot receive or reply to messages with E2EE.
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#### :material-information-outline:{ .pg-blue } Account Termination
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Skiff Mail accounts do not expire, but unpaid accounts will be prompted to remove any enabled paid features (such as additional aliases) or renew their plan before the account can be used.
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#### :material-information-outline:{ .pg-blue } Additional Functionality
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Skiff additionally offers [workspace productivity features](https://discuss.privacyguides.net/t/skiff-pages-drive-productivity-tools/11758/13), but we still prefer [alternative](productivity.md) options for collaborating and file sharing at this time.
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Skiff Mail does not offer a digital legacy feature.
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### Mailbox.org
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!!! recommendation
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@ -155,62 +211,10 @@ These providers store your emails with zero-knowledge encryption, making them gr
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<div class="grid cards" markdown>
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- { .twemoji } [Skiff Mail](email.md#skiff-mail)
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- { .twemoji } [Tuta](email.md#tuta)
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</div>
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### Skiff Mail
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!!! recommendation
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{ align=right }
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**Skiff Mail** is a web based email service with E2EE that began in 2020 that is based in San Francisco with developers worldwide. Accounts start with 10GB of free storage.
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[:octicons-home-16: Homepage](https://skiff.com/mail){ .md-button .md-button--primary }
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[:octicons-eye-16:](https://app.skiff.com/docs/db93c237-84c2-4b2b-9588-19a7cd2cd45a#tyGksN9rkqbo2uGYASxsA6HVLjUoly/wTYK8tncTto8=){ .card-link title="Privacy Policy" }
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[:octicons-info-16:](https://skiff.com/help){ .card-link title=Documentation}
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[:octicons-code-16:](https://github.com/skiff-org/skiff-apps){ .card-link title="Source Code" }
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??? downloads
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- [:simple-android: Android](https://play.google.com/store/apps/details?id=com.skemailmobileapp&pli=1)
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- [:simple-appstore: iOS](https://apps.apple.com/us/app/skiff-mail/id1619168801)
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- [:octicons-browser-16: Web](https://app.skiff.com/mail)
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Skiff has undergone a few [audits](https://skiff.com/transparency) during its development.
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#### :material-check:{ .pg-green } Custom Domains and Aliases
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You can create up to 3 additional @skiff.com email aliases in addition to your primary account address on their free plan. Free accounts can add 1 [custom domain](https://skiff.com/blog/custom-domain-setup), and up to 15 custom domains on a paid plan. You can create unlimited aliases or a [catch-all](https://skiff.com/blog/catch-all-email-alias) alias on your custom domain.
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#### :material-alert-outline:{ .pg-orange } Private Payment Methods
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Skiff Mail accepts cryptocurrency payments via Coinbase Commerce, including Bitcoin and Ethereum, but they do not accept our recommended [cryptocurrency](cryptocurrency.md), Monero. They also accept credit card payments via Stripe.
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#### :material-check:{ .pg-green } Account Security
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Skiff Mail supports TOTP two-factor authentication and hardware security keys using FIDO2 or U2F standards. The use of a hardware security key requires setting up TOTP two-factor authentication first.
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#### :material-check:{ .pg-green } Data Security
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Skiff Mail has zero access encryption at rest for all of your data. This means the messages and other data stored in your account are only readable by you.
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#### :material-information-outline:{ .pg-blue } Email Encryption
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Skiff Mail does not use OpenPGP. Emails are only encrypted with E2EE to other Skiff Mail users. Skiff does not have a "temporary inbox" or "passworded email" feature like some other providers have, so that external users cannot receive or reply to messages with E2EE.
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#### :material-information-outline:{ .pg-blue } Account Termination
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Skiff Mail accounts do not expire, but unpaid accounts will be prompted to remove any enabled paid features (such as additional aliases) or renew their plan before the account can be used.
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#### :material-information-outline:{ .pg-blue } Additional Functionality
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Skiff additionally offers [workspace productivity features](https://discuss.privacyguides.net/t/skiff-pages-drive-productivity-tools/11758/13), but we still prefer [alternative](productivity.md) options for collaborating and file sharing at this time.
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Skiff Mail does not offer a digital legacy feature.
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### Tuta
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!!! recommendation
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@ -343,7 +347,7 @@ Notable free features:
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[:octicons-code-16:](https://github.com/simple-login){ .card-link title="Source Code" }
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??? downloads
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- [:simple-googleplay: Google Play](https://play.google.com/store/apps/details?id=io.simplelogin.android)
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- [:simple-appstore: App Store](https://apps.apple.com/app/id1494359858)
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- [:simple-github: GitHub](https://github.com/simple-login/Simple-Login-Android/releases)
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