ProtonMail now offers Undo Send, letting you cancel outgoing emails

Have you ever fired off an ill-considered email and then thought oops! the moment you hit Send? Or have you sent off an email intended to impress the recipient, realizing with horror, seconds too late, that you have misspelled their name? And the “Reply all” button has been a recipe for far too many disasters. 

Whatever the reason, Undo Send is one of the most popular features requested by ProtonMail users. It is now automatically enabled for all our users in the web interface, and provides a variable length second window during which you can opt to cancel sending an email. 

How to use Undo Send in ProtonMail

When you send an email, the email composer window will close and you will see a banner at the top of your screen which says “Message sent.  Undo.”

If you click the Undo button within the specified time limit, the composer window will reopen and you can continue editing the draft email. 

Undo Send is enabled by default with a 10-second timer . You can change the timer duration from 0 seconds (i.e. Undo Send disabled) to your preferred timer length by going to Settings -> General -> Messages -> Undo Send.

A core part of our mission is to design tools that are secure, protect your privacy, and are also easy to use. To that end, we hope Undo Send will make ProtonMail more convenient and useful for you, and we look forward to hearing your feedback on this and other features in the ProtonMail Version 4.0 beta.

Undo Send FAQ

Who can use Undo Send?

Undo Send is available to all ProtonMail users

Which platforms is Undo Send available on?

Undo Send is initially available on our web app. It will also be included in upcoming versions of our iOS and Android apps.

Do I need to enable the feature?

No. Undo Send is automatically enabled for all ProtonMail users with a default timer delay of 10 seconds.

Can I change the timer delay settings?

Yes. To change the timer length, go to Settings -> General -> Messages -> Undo Send and select your preferred timer length from the drop-down menu. Setting the timer to 0 seconds disables the feature.

Can I recall the email after the timer period is over?

No. Undo Send only delays sending an email for a few seconds. It cannot recall an email once it has been sent. (However, our self-destructing emails feature does provide a related functionality.)

You can get a free secure email account from ProtonMail here.

We also provide a free VPN service to protect your privacy. ProtonMail and ProtonVPN are funded by community contributions. If you would like to support our development efforts, you can upgrade to a paid plan. Thank you for your support.

Updated Jan. 13, 2021.

Feel free to share your feedback and questions with us via our official social media channels on Twitter and Reddit. Note that while blog comments also remain open, questions and feedback will not be responded to individually. Where relevant, we will incorporate the most frequently asked questions or comments into a blog update.

About the Author

Douglas Crawford

Douglas has worked for many years as a technology writer in the cyberprivacy and cybersecurity sector. He is now very pleased to work for a company with a mission that he passionately believes in.


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15 comments on “ProtonMail now offers Undo Send, letting you cancel outgoing emails

  • That’s a great feature.

    But I think it would be great to delay e-mail for a specific time. So you can (optionally) specify while writing when the mail will be sent.

    Best wishes

  • Do you think you could also add send email later? This would allow for scheduling and also act as a longer cancel sending. Thank you!

  • Nice and waiting feature… Now it would be nice to increase up to 30 seconds..(my mind sometimes is not as fast and maybe I will need 10 additional seconds) and the next step (I hope) is to be able to the send the email at specific date and time (scheduled delivery).

  • I have a question regarding the implementation of the functionality: what if I click on send and close the ProtonMail app before the undo delay ? Does the email is sent or blocked/lost ? (Is the email wait on front end to be sent to the server or not ?)

    • Hi Thomas. If you close the tab while it says “Sending message…” then the message will not be sent. Once you see “Message sent. Undo” it is processed by pour backend and if you close without clicking “Undo” then it will be sent.

    • Hi anon. If you close the tab while it says “Sending message…” then the message will not be sent. Once you see “Message sent. Undo” it is processed by pour backend and if you close without clicking “Undo” then it will be sent.

  • I love the features in this Beta version such as sub-folders and delayed send, but when will this “Beta” become standard version?
    This has been at “Beta” status for many, many months now.