We have fielded a great number of emails and calls in the last week or so over a scam email. There is no cause for alarm on the basis of this scam. It looks somewhat like this:

From: [your own email address]
Date: [any time
To: [your email address]
Subject: password (XXXXXX) for [your email address] is compromised
 

Hello!

I'm a hacker who cracked your email and device a few months ago.
You entered a password on one of the sites you visited, and I intercepted it.
This is your password from [your email address] on moment of hack: XXXXXX

Of course you can will change it, or already changed it.
But it doesn't matter, my malware updated it every time.

Do not try to contact me or find me, it is impossible, since I sent you an email from your account.

Through your email, I uploaded malicious code to your Operation System.
I saved all of your contacts with friends, colleagues, relatives and a complete history of visits to the Internet resources.
Also I installed a Trojan on your device and long tome spying for you.

You are not my only victim, I usually lock computers and ask for a ransom.
But I was struck by the sites of intimate content that you often visit.

I am in shock of your fantasies! I've never seen anything like this!

So, when you had fun on piquant sites (you know what I mean!)
I made screenshot with using my program from your camera of yours device.
After that, I combined them to the content of the currently viewed site.

There will be laughter when I send these photos to your contacts!
BUT I'm sure you don't want it.

Therefore, I expect payment from you for my silence.
I think $827 is an acceptable price for it!

Pay with Bitcoin.
My BTC wallet: [bad guy bit coin wallet code]

If you do not know how to do this - enter into Google "how to transfer money to a bitcoin wallet". It is not difficult.
After receiving the specified amount, all your data will be immediately destroyed automatically. My virus will also remove itself from your operating system.

My Trojan have auto alert, after this email is read, I will be know it!

I give you 2 days (48 hours) to make a payment.
If this does not happen - all your contacts will get crazy shots from your dark secret life!
And so that you do not obstruct, your device will be blocked (also after 48 hours)

Do not be silly!
Police or friends won't help you for sure ...

p.s. I can give you advice for the future. Do not enter your passwords on unsafe sites.

I hope for your prudence.
Farewell.

Again, this email or similar variant is being sent to lots and lots of people. It is a scam and your Mac is under no threat from it. You may safely laugh at it (might as well) and send it to the Trash. If you are concerned about the security of whatever account is referenced in the email, feel free to change the password on that particular account.