Sonos exposed some customers’ email addresses in Bcc apology gaffe

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One of the most important rules of mass-emailing is to use the blind copy field, so you don’t reveal the addresses of all your recipients. Unfortunately, it looks like someone at Sonos didn’t get that memo, as a staff member recently used the viewable ‘copy’ field when sending out an apology email.

A grand total of 450 email addresses were revealed because of the error – with some people taking to Twitter to vent at the company.