This is why it very important for us to know how to read the header, because of you only check buy opening the email you will be trick that the email is legit, and then you will probably click the link knowing that its not harmful and before you know it you already infected with types of malwares etc.
so how to know if an email is disguising as a email that you have know?
in this example:
1. you have to look for the email address in the header this is very important
mostly it will show a legitimate email in front but at the back its a different email
if its correct but still you have dooubts
2. Try to ask the sender if he/she send an email with that link of something suspicious.
3. Never click the link no matter what , specially if you don't know what is happening, delete it if he/she confirms he does not send anything.
4. Warn your friend to scan his / her pc because its going to get worse it will send emails to everyone which means disaster.
lastly always be updated on what is happening in the web , so that you know what to do
Hope this helps