Email and Documents are the two most frequent modes of Security breaches that happen in any Organization. So, it is extremely important that proper Security should be implemented for the same.   Defender for Office 365 Plan 1 is a Fantastic Solution which offers protection for Email and Documents.  You can read more about the Solution here: https://www.techgyan.in/email-security-and-document-security/. The license of Defender for Office 365 Plan 1 is available as a Standalone Solution or as a part of Microsoft 365 Business Premium:  https://www.techgyan.in/why-microsoft-365-business/  

However, the Solution is only as good as the way it is implemented and managed.  TechGyan offers One Time Professional Services and Ongoing Managed Services to ensure that your Organization is well protected on an ongoing basis. Here is the list of Professional Services and Managed Services that we offer for our Customers to protect them from Email and Document based Threats.