Yes, all Tutanota clients are published as open source under GPLv3. Check out our GitHub repository. We welcome you to review the code, to give us feedback or to contribute!
Yes, Tutanota is a green email service that relies exclusively on renewable energy for all email systems.
Yes, Tutanota offers secure business email accounts with lots of whitelabel customizations. You can place the login for your employees directly on your website with a whitelabel domain. Tutanota also offers Secure Connect, an open source encrypted contact form so clients can get in touch with you confidentially directly on your website. Learn here how to use Tutanota in your organization or company with your custom email domain.
Here's a list of all whitelabel customizations for business use. Here's an instruction how to whitelabel Tutanota for your business, how to add the encrypted contact form Secure Connect to your website and more.
Secure Connect is an open source encrypted contact form which enables every visitor of your website to contact you confidentially. Check here how to book Secure Connect and how to send an encrypted message via Secure Connect.
Yes, Tutanota as an encrypted email service is perfectly suited for any business that would like to use a GDPR-compliant email service.
Yes, right after registration of a business account you will find a data processing agreement directly in Tutanota under Settings -> Subscription.
Yes, an encrypted calendar is integrated into the Tutanota mail client.
Please check that the time zones of your devices are in sync, including daylight saving time.
If you are using Firefox/Tor Browser with resistFingerprinting option in about/config, this automatically resets the browser time zone to UTC, which then leads to sync issues.
Yes, Tutanota will include a whole set of collaboration options such as working together on task lists and documents in the future. You can already book this collaboration tool. Right now it is called 'sharing feature' as you can now share your encrypted calendars with other paid accounts. This is the first step, more collaboration options will be added at no extra cost as Tutanota progresses.
We donate the business version of Tutanota to non-profit organizations (NPOs). Please find details on how non-profit organizations can secure their emails for free or with a discount.
If you can't login to your account, this has been caused by one of the following reasons:
Our secure password reset feature enables you to reset your account yourself. Please write down your recovery code somewhere safe.
If you think your password was disclosed to someone else but you can still log into your account, please do the following:
If the attacker had been logged in as well, changing the password automatically logs him out.
We encourage you to always use 2FA with your accounts as it makes it close to impossible for an attacker to log into your account.
If you can not log into your account any more, please check this FAQ.
The Tutanota clients use REST services but there is no public documentation for that API or for a library, yet. Keep in mind that when user data is stored in or read from Tutanota, it has to be encrypted/decrypted on the client. You may of course dig into the open source code of Tutanota and integrate with your product, but at this time we can not provide any support for this. We will add a public API documentation in the future.
When you sign up for Tutanota, you create an email account. This account initially has one user which is also an administrator. Free accounts only have one user. If you upgrade to a paid subscription, you can add users to your account. You manage the users (deactivate a user, change password) within your Tutanota account with your administrator user. You may also allow multiple users to be administrators.
In the diagram the '1' at the arrows means there is one item assigned. A user has one mailbox and one address book. The '*' means multiple items may be assigned, e.g. an account has one or more users, a user may have multiple calendars and a mailbox may have multiple email aliases (paid feature). By the way, a mailbox also has a main email address.
The date format for your mailbox as well as your calendar is picked either from your language settings in Tutanota or from your system/browser settings. If you pick 'English' under 'Settings' -> 'Appearance', the American date format is displayed. If you pick 'Automatic' under languages, the date format of your browser/system is displayed. If you pick any other language, e.g. German, the date format of this language, e.g. German, is displayed.
No. When a password is used for authentication (login), it is not necessary that it is known to the server you want to authenticate with. The server only needs a fingerprint (hash) of your password. With Tutanota your hash for authentication is calculated by your browser and only the hash is being sent. Your password never travels the Internet in plain text and it is never seen by our server. As hashes are non-invertible, the server is unable to reconstruct your password from the hash. The server is not able to decrypt your message, but still able to log you in.
Recommended for further reading: Learn how Tutanota automates the encryption process while leaving you in full control of your encrypted data.
Your password is salted and hashed with Bcrypt on your device before being transmitted to Tutanota. Bcrypt is the most reliable method because brute-force attacks need much more time in comparison to conventional methods such as MD5 or SHA. With this method we guarantee an integrated confidentiality and we allow you to access and decrypt your emails from desktops and mobile devices instantly.
Tutanota uses a password strength indicator that takes several aspects of a password into consideration to make sure your chosen password is a perfect match for your secure email account. You can find additional tips on how to choose a strong password here.
Tutanota has no limitations in regard to the password length or used characters; all unicode characters are respected.
Yes, Tutanota supports two-factor authentication with U2F and TOTP. Here are details on how to set up your second factor in Tutanota.
If you click on 'Logout', you log out. Please note: If you have previously saved the password, you are now logged out, but the password is still saved for automatic login. To 'unsave' the password, please log out. The login screen appears, click on 'More' and 'Delete credentials'.
Tutanota encrypts all data stored in your mailbox (contacts, emails, email signature, inbox rules, invoice data, payment method, certificate and private keys of your own domains). When sending an email, Tutanota encrypts subject, content and attachments automatically.
You can find a detailed explanation about what is encrypted in Tutanota on our encrypted email page.
We can read only the following metadata:
We are looking into possibilities to hide the metadata in the future as well.
Your private and your public keys are generated locally within your browser upon registration. Your private key is encrypted with your password. This way your login password receives the status of the private key. The key is encrypted so strong that only you can use the key for encrypting and decrypting data. This is why a strong password is essential. An automatic password check on the client makes sure that you use a strong password. Your password is never transmitted to the server in plain text. It is salted and then hashed with bcrypt locally on your device so that neither the server nor we have access to your password. With this innovative design you can access your encrypted inbox from any device (desktop, mobile) easily.
For the email encryption between users, Tutanota uses a standardized, hybrid method consisting of a symmetrical and an asymmetrical algorithm. Tutanota uses AES with a length of 128 bit and RSA with 2048 bit. Emails to external recipients are encrypted symmetrically with AES 128 bit.
The system automatically encrypts all emails stored in Tutanota. Emails between Tutanota users are automatically encrypted end-to-end, emails to external users can be secured with the help of a password. Here we explain the differences between a confidential (end-to-end encrypted) and a non-confidential email.
Independent of the end-to-end encryption, the transport between client and Tutanota servers is secured with TLS to maximize security.
The Tutanota servers are located in secure and ISO27001 certified data centers in Germany. All saved data are subject to the strict German privacy protection laws. Independent of that all data is end-to-end encrypted and cannot be read by the Tutao GmbH as the provider or by any third party.
By default, we do not log IP addresses when you log in or when you send an email. The IP addresses of sent and received emails are stripped so that your location remains unknown.
We only log IP addresses of individual accounts in case of serious criminal acts such as murder, child pornography, robbery, bomb threats and blackmail after being served a valid court order by a German judge. You can find details on this as well as on German data protection rights on our blog.
Learn on our blog how Tutanota fights illegal mass surveillance by providing an anonymous email service. Upon registration you do not need to provide any personal data (e.g. no phone number required). We will also make it possible to pay for Tutanota with Bitcoin.
Yes. You can view and remotely close active sessions under Settings -> Login.
Check our How-to to learn how to enable storing of closed sessions to monitor whether someone else has access to your account. To guarantee the users' privacy, we have implemented the feature as follows:
Free of charge accounts are deleted if they were not used for at least six months. Your deleted email address (also if it is an alias) will not be recycled for security reasons. There must be no possibility that someone else is able to register your previously used email address, and then, by accident, receive a confidential email that was meant for you.
Tutanota does not load pictures automatically when you open an email. When you load external images manually, please note that
Here we explain how to display external images. Please read here how we make sure that you can use Tutanota as an anonymous email service. We plan to improve image loading in the future so that you can whitelist trusted senders; images in emails from these senders are then loaded by default.
Phishing is a name or type of online scam in which criminals try to look like a legitimate sender in order to get your data such as credentials or credit card data. Phishers use very sophisticated psychological techniques and develop very realistic copies of real websites and emails.
If you see a phishing banner, it means that some parts of this email match our phishing signatures after other users reported similar emails as phishing. Please be extremely careful with such messages. Usually phishing emails contain a special link to the website which looks real but it actually is not. If you think that the email is legitimate and you opened the link, please make sure to check the full website URL: Check that you see all of it, sometimes only one part or one character may be swapped. Here is more information on how to prevent email phishing attacks.
You can mark an email as not phishing so you will not see the warning message any more for this email.
We never send you emails with links where you need to type in your password. We encourage you to always protect your login credentials with 2FA as this makes it close to impossible for an attacker to log into your account.
If you already fell for a phishing attack, please check this FAQ.
We require all messages to be authenticated. Without authentication, the email could be coming from anyone or could be modified so you should always treat such emails with scrutiny. If you see a message where the authentication has failed (red warning banner), you should be especially careful as it means that this email was likely faked.
Yes, Tutanota comes with full-text search of your encrypted mailbox. In the free version, search is limited to four weeks into the past due to heavy server load caused by the encrypted search feature. Learn here how you can improve your search results. The spam folder is excluded from search.
Search is executed locally via an encrypted search index to guarantee security and privacy of your data as well as your search queries. As the search index needs to be stored in your browser, it does not work in private mode/incognito mode. Read here how our innovative full-text search on encrypted data works.
The language in Tutanota is taken automatically from your browser or system settings. Please change the language there. Alternatively, you can go to 'Settings' -> 'Appearance' to switch the displayed language for Tutanota.
We also invite you to join our translation project to improve Tutanota in your native language!
You can download the Tutanota app from the following stores:
In addition to that, you can also directly download and install the APK for Android. Keep in mind that you will not get updates automatically if you install the app manually instead of using an app store. You can add our blog to your RSS-reader with this link to get notified about updates: RSS-Feed
Please check the app settings on your phone. As we do not use Google's push notifications service, battery optimization must be disabled for Tutanota to receive push notifications instantly.
This is necessary to offer you an open source email service free from any links to Google.
WebView is a system app on Android devices which allows us to display web content inside the Tutanota app. Newer versions let us use newer technologies to make the app smaller, faster, more beautiful and more reliable. If you experiencing issues or bugs with the Android app, updating WebView has a good chance to help.
In the mobile app, you can currently only login with one user. To switch to another user, you must log out and log in again. You can login with multiple users in the browser by opening several tabs or windows. In the desktop clients, you can also open several windows to login with multiple users.
You can download the Tutanota desktop clients (Windows, Linux, Mac OS) on our homepage.
Yes, you can add existing email addresses (e.g. Alice2, Alice3) as aliases to a paid account (Alice1). Before you can add the aliases, you need to delete the other accounts (Alice2, Alice3) and specify the paid account (Alice1) as the take over account upon deletion. We explain here how to take over the email addresses.
Please note: You are only transferring the email addresses. Emails and contacts stored in the deleted accounts (Alice2, Alice3) are being deleted. Please export important emails before deleting the accounts.
Tutanota is very easy to use. From the start we focused on usability and kept the encryption process in the background. You do not have to install anything or worry about key handling. Tutanota is as easy to use as Gmail or any other webmail service.
You can start with Tutanota right away. If any questions remain, check our detailed how-to.
This describes all Settings of Tutanota. It also answers common usability questions such as:
How to send an encrypted email?
How to switch to not confidential?
How are contacts sorted?
How to add / rename / delete a folder?
How to use multi-select and shortcuts?
How to upgrade to Premium?
How to set up an alias?
How to send an email from an alias?
How to manage passwords for my Premium users?
How to send emails with my own domain?
How to add an encrypted contact form to my website?
How to delete an account?
Current encryption standards like PGP and S/MIME have several issues that we plan to address with Tutanota. These standards do not support forward secrecy and are not resistant to attacks from quantum computers.
In addition, it is important to us that the subject line in emails is also encrypted. That's why we have developed a solution that is also based on recognized algorithms (RSA and AES) and that automatically encrypts the subject, the content and the attachments. In the future, we plan to upgrade these algorithms to quantum-resistant ones that also support forward secrecy. You can find more information on why Tutanota does not use PGP here.
We also see the importance that Tutanota needs to be interoperable with other encryption solutions. We will develop an API so that Tutanota users can communicate with users of other secure services confidentially in the future.
Tutanota supports the current version of the following browsers:
Opera (desktop, Android)
Chrome (desktop, Android)
Safari from version 11.0 (desktop, iOS)
Microsoft Edge (desktop)
Tutanota also works in Internet Explorer 11, but this browser is not officially supported.
This is not possible as we could not guarantee end-to-end encryption for your data. Instead Tutanota offers email desktop clients for Linux, Mac OS and Windows as well as a web client and apps for Android and iOS.
Yes, you can always access the emails sent via Tutanota through the link from your latest notification email. Old notification links from the same sender are de-activated for security reasons. Your exchanged password, however, stays unchanged as long as the sender does not change it. If you have saved the password upon accessing your confidential emails in your browser, you do not have to re-enter it.
Yes. Tutanota uses a preshared password for sending an encrypted message to an external recipient, i.e. to someone who does not use Tutanota. Please check our how-to to learn how to send encrypted emails to external recipients.
Here we explain how to switch the default so that emails to external recipients are sent not encrypted and without a password.
If you add another user to your account (family member, partner, team member etc.), you get the following benefits:
Furthermore, we have recently added a sharing feature for the encrypted calendar which we will extend in the future. Sharing of entire calendars only works with other paid Tutanota accounts.
Email aliases are additional email addresses that you can use with the same mailbox without having to switch accounts. Aliases are included in al paid plans of Tutanota. If you upgrade to Premium (€1 per month), you can add up to 5 aliases.
Find out more about Tutanota aliases in our How-to (create alias, change default sender, etc.). Learn here what the purpose of an email alias compared to a user is and how aliases can increase your security.
No, Tutanota does not support plus addressing (firstname.lastname@example.org) for Tutanota domains. If you want to register with different plus addresses at different sites, you can add an alias package to your account (limited to the number of aliases you book). Alternatively, you can use a custom email domain with catch-all to create an unlimited number of plus addresses for incoming emails.
Yes, any paid subscription of Tutanota comes with custom email domain support. Once upgraded, you can add as many domains as you like.
Please refer to our how-to to learn how to add your own email domains to your Tutanota account and how to make sure that your records (MX, SPF, TXT, DKIM, DMARC, CNAME) are set up correctly in your DNS as well as how to activate/deactive catch-all and more.
Yes, Tutanota uses a spam filter to keep your mailbox free from spam. We are improving this filter continuously. Should you receive spam emails in your inbox, you can also configure your own spam rules here to deny or allow certain email addresses or domains. If a sender is blocked (rejected) by the spam filter, you can allow the sender for your account.
In paid accounts, only admins can create spam rules that are being applied across all users.
Yes, Tutanota supports an unlimited number of inbox rules / filters for paid accounts. Check our how-to to see how to set up inbox rules.
Yes, Tutanota uses different variables to calculate email limits for individual accounts. This is necessary to protect our free and anonymous email service from spammers who try to abuse Tutanota. If spammers were able to abuse Tutanota, it would harm all Tutanota users - ie Tutanota domains could end up on email spam lists, which we have to prevent under all circumstances.
If you receive the following message in your Tutanota account "It looks like you exceeded the number of allowed emails. Please try again later.", the anti-spam protection method has stopped your account temporarily from sending new emails. Please wait a day or two to send new emails again.
If you need to send more emails immediately, please upgrade to our affordable Premium version (1 Euro per month) as limits for paying users are much higher. Simply click on 'Premium' in your side menu bar of Tutanota.
Please note that Tutanota is not meant for sending out mass mailings such as newsletters. Please read our Terms & Conditions for details.
Yes, email addresses are automatically added to your encrypted Tutanota address book when sending an email unless you deactivate this feature. You'll find details here.
Emails: You can export individual emails or batch-export emails by using multi-select. Email import is not yet possible. We plan to support email import as well as an even easier export function with our new secure desktop clients.
Calendars: You can import and export calendars via .ics. Just click on the three-dot button next to the calendar you wish to import data to or you wish to export.
Yes, Tutanota supports HTML editing options (embed images, add lists, bold, italics, underline, monospace, add hyperlinks, align the text left, center, right, justified, change text size, remove all formatting). These are explained in our how-to along with lots of information on email handling.
Yes, with a paid subscription you can set up email notifications to any email address under 'Settings' - 'Email' - 'Notifications'. You will be informed about new emails once until you log in. Only if you have logged in to view this email, Tutanota will send another notification to keep notification emails to a minimum.
As a Free user, you can receive push notifications in the browser, the Android & iOS app as well as the desktop clients.
Yes, the Tutanota Transparency Report is updated every six months. You can check it here. It also includes a Warrant Canary.
Yes, you can downgrade back to free anytime. Before this, you need to disable all extra bookings. You can keep your main Tutanota email address as a free account.
Check here to see how you can upgrade or downgrade and how to add or disable extra bookings (aliases, storage, additional users).
Some accounts are automatically marked for approval upon sign-up to prevent abuse. This often affects IPs from VPN services or Tor as spammers try to bypass our anti-spam protection method by abusing these services. Please read here why the 48-hour wait is necessary to protect your privacy to the maximum with a truly anonymous email service.
During these 48 hours emails cannot be sent or received. Please do not share your new email address before the blocking has been lifted automatically.
Please check whether the sender was blocked by following this instruction.
Sometimes newly created email addresses are put on hold for 48 hours to prevent abuse. It is important that you do not share your email address until this block is lifted automatically. If you do use the email address to register elsewhere or sign up for newsletters before the block is lifted, this service will send you a confirmation email, which will bounce with a temporary error. This might lead to problems registering with this service, even in the future.
Most websites and online services let you register with your chosen Tutanota email address just fine. Unfortunately, we have received reports by users that some websites block Tutanota email addresses for registrations. Please check these options to resolve this situation.
Tutanota uses its own Captcha so that we do not have to depend on using Google Captcha. This enables us to offer an open source email service without any links to Google.
The Tutanota Captcha shows a clock. You need to enter the displayed time with four numerals, including the colon in the middle. If the displayed time is 8.30 for example, you have to enter 08:30 or 20:30 exactly.
If you would like to inform us about abusive usage of one of our domains (tutanota.com, tutanota.de, tutamail.com, tuta.io, keemail.me), please contact us at email@example.com. Please forward the abusive message to us if appropriate.
If you are a Tutanota user and have received a phishing email, you can report this email by clicking on the three-dot button to the right and then click on 'Report phishing'. Here are more details.
If you would like to report abusive usage originating from another provider's email address, you can find contact addresses at abuse.net.