We recently had a situation where a mass email was accidentally sent out via Mixpanel.
We realized this shortly after pressing the send button.
What sucked though was that there was absolutely no way to pause the email campaign. All we could do was sit back and watch the emails get sent out.
What mechanisms does Mixpanel have to prevent this or at least do some damage control?
Mailchimp, for example, lets you pause emails even they've been scheduled to sent: https://mailchimp.com/help/cancel-a-campaign/