什么是 Delta Chat?

Delta Chat 是一个新的聊天应用,它通过电子邮件发送消息,并在条件允许情况下使用 Autocrypt 对其进行加密。您不必在任何地方进行注册,在 Delta Chat 中使用您现有的电子邮件帐户即可。


通过 Delta Chat,您可以发消息到每个现有的电子邮件地址 - 即使 收件人没有使用 Delta Chat 应用。不需要 像其他通信软件一样,要收件人和您安装同样的应用。

与其他通信软件相比,Delta Chat 有哪些优势?

哪些消息会在 Delta Chat 中出现?

Delta Chat 自动显示:

其他消息不会自动出现,而是可以在联系人请求中找到。 如有需要,可以从那里开始聊天。


Delta Chat 支持图像、视频和其他附件吗?


Delta Chat 支持 HTML 电子邮件吗?

为什么我必须在 Delta Chat 中输入我的电子邮件密码? 这样安全吗?

As with other E-Mail programs like Thunderbird, K9-Mail, or Outlook, the program needs the password so you can use it to send mails. Of course, the password is stored only on your device. The password is only transmitted to your E-Mail provider (when you login), which has access to your mails anyway.

If you use an E-Mail provider with OAuth2 support like gmail.com or yandex.ru, there is no need to store your password on the device. In this case, only an access token is used.

As Delta Chat is Open Source, you can check the Source Code if you want to verify that your credentials are handled securely. We are happy about feedback which makes the app more secure for all of our users.

Delta Chat 需要哪些权限?

Depending on the operating system in use, you may be asked to grant permissions to the app. This is what Delta Chat does with these permissions:







What do double ticks mean in group messages? Has everyone read my message now?


Delta Chat 支持端到端加密吗?



How can I verify cryptographic status with a sender?

If you are within immediate distance of the chat partner:

If you are not near the chat partner, you can check the status manually in the “Encryption” dialog (user profile on Android/iOS or right-click a user’s chat-list item on desktop):

How can I check the encryption of messages?


What is the difference between verified groups and 1:1 chats with verified contacts?

Delta Chat 支持前向保密吗?

Delta Chat 如何保护我的元数据?


If you don’t have a key or don’t even know you would need one - don’t worry: Delta Chat generates keys as needed, you don’t have to hit a button for it.

我无法将现有的 PGP 密钥导入 Delta Chat。

The most likely cause is that your key is encrypted and/or uses a password. Such keys are not supported by Delta Chat. You could remove the passphrase encryption and the password and try the import again. If you want to keep your passphrase you’ll have to create an e-mail alias for use with Delta Chat such that Delta Chat’s key is tied to this e-mail alias.

Delta Chat supports common OpenPGP private key formats, however, it is unlikely that private keys from all sources will be fully supported. This is not the main goal of Delta Chat. In fact, the majority of new users will not have any key prior to using Delta Chat. We do, however, try to support private keys from as many sources as possible.

Removing the password from the private key will depend on the software you use to manage your PGP keys. With Enigmail, you can set your password to an empty value in the Key Management window. With GnuPG you can set it via the command line. For other programs, you should be able to find a solution online.

为什么不使用 pEp(pretty easy privacy)?


我能同时在多个设备上使用 Delta Chat 吗?

If you want to use the same account on different devices, you should export a backup from the old device, and import it into the new device:

有推出 Delta Chat Web客户端的计划吗?


This is an experimental setting for some people who are experimenting with server-side rules. Not all providers support this, but with some you can move all mails with a “Chat-Version” header to the DeltaChat folder. Normally, this would be done by the Delta Chat app.

Watching the Inbox makes sense to turn off, if you have both:

In this case, Delta Chat doesn’t need to watch the Inbox.


Sending a copy of your messages to yourself ensures that you receive your own messages on all devices. If you have multiple devices and don’t turn it on, you see only the messages from other people, and the messages you send from the current device.

The copy is sent to the Inbox, and then moved to the DeltaChat folder; it’s not put into the “Sent” folder. Delta Chat never uploads anything to the Sent folder because this would mean uploading a message twice (once through SMTP, and once through IMAP to Sent folder).

The default setting for copy-to-self is “no”.


The only reason one wants to watch the Sent folder is if you are using another mail program (like Thunderbird) next to your Delta Chat app, and want your MUA to participate in chat conversations.

However, we recommend using the Delta Chat Desktop Client; you can download it on get.delta.chat. The option to watch the “Sent” folder might go away in the future. It was introduced at a time where there was no Delta Chat Desktop client available on all platforms.

为什么我可以选择不监视 DeltaChat 文件夹?

Some people use Delta Chat as a regular email client, and want to use the Inbox folder for their mail, instead of the DeltaChat folder. If you disable “Watch DeltaChat folder”, you should also disable “move chat messages to DeltaChat”. Otherwise, deleting messages or multi-device setups might not work properly.


Does Delta Chat work with my e-mail-provider?

使用电子邮件的 Delta Chat 真的是_即时_通讯工具吗?

Delta Chat 与 Protonmail / Tutanota / Criptext 兼容吗?


Delta Chat 的开发是如何被资助的?

First of all, Delta Chat does not receive any Venture Capital and is not indebted, and under no pressure to produce huge profits, or to sell users and their friends and family to advertisers (or worse).

Delta Chat developments have so far been funded from four major sources:

The monetary funding mentioned above was organized by merlinux GmbH in Freiburg (Germany), and then distributed to almost a dozen contributors.

Funding for 2020/2021 is yet to be determined. We are pursuing several opportunities with different organisations and partners. We also are considering to ask for donations. In fact, we experimentally started a little Delta Chat / Liberapay donation account but have not published this yet. There were also around 3-4K so far donated to Bjoern’s (the original author of Delta Chat) paypal and bitcoin donation channels.