Do not download the attachment as it may have viruses, malware, or bugs, which might corrupt your system.
Do not visit any links as they might redirect you to an unintended page.
As fake email addresses are common and easy to create, you should not perform any action like clicking/downloading any links, unless you confirm it with the actual person.
Many websites masquerade as legitimate sites to steal sensitive information, so you should be careful not to fall into the wrong hands.