{"UUID":"f824c623-7f26-4bf7-9c02-7c39475af100","URL":"https://gist.github.com/jomo/2bae3821acb433d0446d","StartTime":"0001-01-01T00:00:00Z","EndTime":"0001-01-01T00:00:00Z","Categories":["postmortem"],"Company":"Google","Product":"","Description":"A mail system emailed people more than 20 times. This happened because mail was sent with a batch cron job that sent mail to everyone who was marked as waiting for mail. This was a non-atomic operation and the batch job didn't mark people as not waiting until all messages were sent."}