I've received an email about leaked information, but there's no information about the source.
Sometimes, certain pieces of information can be identified as leaked (exposed) without the original source being available. Unfortunately, we're unable to investigate this further. As the recipient of this information, what you can do is, if the password has also been leaked, change the password across all systems/services where you've used that specific email address as the username. If only the emails have been leaked, be especially vigilant about spam and phishing attempts.
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