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I received an email purporting to be from Firefox security. It said I had a new sign on from a guy in Mexico. It wanted me to reply if I have concerns.

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I received an email purporting to be from Firefox security. Said I had a new sign on from a guy in Mexico. It wanted me to reply to the email. But I don’t want to do that if this is a scam. How can I tell?

I received an email purporting to be from Firefox security. Said I had a new sign on from a guy in Mexico. It wanted me to reply to the email. But I don’t want to do that if this is a scam. How can I tell?

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Hope this helps you to decide if the email was valid:

Mine doesn't tell me to reply to it though, so I assume this is not identical to what you got?

What is the sender in your case? What email address do you see when you hit reply to write the response?