Let’s Encrypt, an open source provider of Certificate Authority, accidentally leaked thousands of emails to their subscribers. The organization disclosed revealed that 7,618 email addresses
were exposed.
The leak sprung from a mass email about a change a change to the organization's subscription agreement. Then an automated mailer-bot added previous recipients to the body of
each subsequent message by mistake and this process snowballed until everyone on the list was exposed. Read the whole story at Bitcoinist »