…to all your questions. Please also check our How-to to learn everything you need to know about Tutanota.
はい、Tutanota ウェブメールクライアントは、個人ユーザー向けの 1 GB のストレージ容量が永遠に無料で利用
できます。
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 offers a whitelabel version for businesses, which includes customizations of the logo and design. You can also place the login for your employees directly on a subdomain of your website.
If you can't access your account, this has been caused by one of the following reasons:
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 it secure. 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.
はい。TutanotaはU2FまたはTOTPの二段階認証をサポートしています。こちらで詳細な設定方法を確認できます。
U2Fは現在Firefoxでは動作しないことに注意してください。
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 SSL and DANE to maximize security.
私たちはあなたがログインしたときやメールを送るときにIPアドレスを記録しません。また、あなたの居場所が特定されないよう送受信されたメールのIPアドレスも削除されます。
Tutanotaが匿名メールサービスを提供する方法については、私たちのブログをご覧ください。登録に際しては、電話番号などの個人情報を提供する必要はありません。また、ビットコインでPremiumやProなどの有料プランの料金を支払うことができます。
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.
Yes, Tutanota comes with full-text search of your encrypted mailbox. Learn here how you can improve your search results.
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.
Tutanotaは、簡単に利用できます。当初から私たちはユーザビリティに焦点を当て、バック グラウンドでの暗号化プロセスを維持してきました。何かをインストールしたり、鍵の処理を心配したりする必要はありません。Tutanotaは、Gmailやその他のウェブメールサービスと同等のユーザビリティを提供しています。
Tutanotaはすぐに使い始められます。何か質問がある場合は、下記の詳しい使い方 を確認してください。
ここではTutanotaのすべての設定について説明しています。ユーザビリティについての以下のような質問にも答えています。
暗号化されたメールを送信する方法
非機密設定に切り替える方法
連絡先の並べ替え方法
フォルダーの追加/名前の変更/削除の方法
Premiumにアップグレードする方法
別名(エイリアス)を設定する方法
エイリアスからメールを送信する方法
Premiumユーザーのパスワードを管理する方法
自分のドメインでメールを送信する方法
暗号化された問い合わせフォームを自分のウェブサイトに追加する方法
以下のストアから Tutanota アプリをダウンロードできます。
Android 用 APK を直接ダウンロードして、インストールすることもできます。アプリストアを使用するかわりに手動でアプリをインストールした場合、自動的には更新されないことに留意してください。アップデートの通知を受け取るためには、このリンクを使用して RSS リーダーに私たちのブログを追加してください : {rssFeedLink}
You can download the Tutanota desktop clients (beta) here:
Please find lots of details on how to get started with the desktop clients in our How-to.
Yes, you can add existing email addresses (e.g. Alice2, Alice3) as aliases to a Premium account (Alice1). Before you can add the aliases, you need to delete the other accounts (Alice2, Alice3) and specify the Premium 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.
Current encryption standards like pgp and S/MIME have several issue 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 Tutanota's encryption design on our blog.
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:
Microsoft Edge (desktop)
Tutanota also works in Internet Explorer 11, but this browser is not officially supported.
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, to someone who does not use Tutanota. Please check our how-to to learn how to send encrypted emails to external recipients.
Email aliases are additional email addresses that you can use with the same mailbox without having to switch accounts. Aliases are a Premium feature. If you upgrade to Premium (€1 per month), you can add up to 5 aliases.
はい。Tutanota Premiumと Pro はカスタムドメインをサポートしています。アップグレード後に、必要な数のドメインを追加できます。Tutanota アカウントに独自のドメインを追加する方法については、こちらをご覧ください。
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.
In paid accounts, only admins can create spam rules that are being applied across all users.
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 blacklists, 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 Premium users are much higher. Simply click on 'Premium' in your top 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, you can downgrade back to free anytime. Before this, you need to disable all extra bookings (aliases, storage, additional users). You can keep your main Tutanota email address as a free account.
Check here how you can upgrade and downgrade.
Some accounts are automatically marked for approval to prevent abuse and to enable you to sign up for a 100% 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.
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 abuse@tutao.de. Please forward the abusive message to us if appropiate.
If you would like to report abusive usage originating from another provider's email address, you can find contact addresses at abuse.net.
For non-profit organizations (NPOs) we have the following special offers:
Conditions: