Configuring MFA for all users to decrease their reliance on other authentication is the best option to improve email security at the company. MFA stands for multi-factor authentication, which is a method of verifying a user's identity by requiring two or more factors, such as something the user knows (e.g., password), something the user has (e.g., token), or something the user is (e.g., biometric). MFA can prevent unauthorized access to email accounts even if the username or password is compromised orshared. Verified References:
https://www.comptia.org/training/books/casp-cas-004-study-guide , https://www.csoonline.com/article
/3239144/what-is-mfa-how-multi-factor-authentication-works.html