No email service can save you from embarrassing mistakes (such as forgetting to remove a CC, accidentally choosing “Reply all”, or misspelling the recruiter’s name), but, with the right features, some can be prevented.
As of today, paying ProtonMail users have a five-second window to cancel sending an email, thanks to the “Undo Send” feature.
Learn more:
https://protonmail.com/blog/undo-send/
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@protonmail that's a pretty nice feature. Thanks! And thanks for using Mastodon for announcements as well. You folks are great.
Server run by the main developers of the project 
It is not focused on any particular niche interest - everyone is welcome as long as you follow our code of conduct!
@otaviocc We're happy to hear that, Otavio. Thank you for your feedback!