Here are few more things you can consider,
No legitimate organisation will send emails from an address that ends ‘@gmail.com’.
The domain name associated with the email is misspelt
The email is not well written
Email contains suspicious attachments or links
Suspicious links
Big offering in the...
I got hundreds of emails like this on daily basis. First you should check the sender email id, and check the domain associated with it. Never open any link on the first place, first insure that Email is genuine, and if there is any doubt then you should probably Ignore the email.