Bugs in email clients aren’t unheard of, but they typically affect only those messages sent by or intended for you. Edison, however, had a more serious hiccup. It confirmed (via The Verge) reports that a bug in Edison Mail for iOS would show messages intended for other people without requiring their sign-ins — a major privacy issue, to put it mildly. The developer attributed the flaw to an update that reached a “small percent” of the user base before reverting back.

The company stressed that this wasn’t data breach, and that it was “reaching out” to affected users as quickly as possible.