There are several red flags that identify a malicious email that you can keep an eye out for. Suspicious or misspelled domains or senders, poorly/unusually written emails, and unusually urgent requests for financial transactions or information are examples of things you might notice in an email that could be malicious. For more in-depth info about how to recognize and avoid phishing scams click the link below.
https://www.consumer.ftc.gov/articles/how-recognize-and-avoid-phishing-scams