There are several ways to detect a scam. Some are very easy, like the one shown below, while some needs a bit more work.
1. Bad grammar
Noticed how the word 'noticed' was spelled 'noticied'? Apparently a lot of scammers do not come from the English speaking part of the world.
2. Fake sender
The sender is not from @paypal.com but from @outlook.com. PayPal and all these organisation has their own domain. They will not use any other email domains.
3. Fake link.
If you hover of the 'Login PayPal', you can see at the bottom showing the actual link which is not pointing to PayPal.
4. Fake URL
If you click on the link, it will bring you to the actual URL and as you can see, it is not paypal.com but pcypal.com, which is clearly bogus.