Likely, you’re already paying for spam filtering through your Office 365 or Microsoft 365 subscriptions. So why aren’t you optimizing it? Two reasons why you’ll want to put a little more time into it:

  1. Productivity: reduce the amount of spam emails to end users. They get enough already!
  2. Security: increase your overall security posture by reducing the amount of phishing and other email attacks to end users.

Need more technical details start here: https://docs.microsoft.com/en-us/microsoft-365/security/office-365-security/protect-against-threats?view=o365-worldwide