Microsoft 365 - MS Cloud Explorers

Tenant Allow and Block List in Microsoft 365 Defender

January 13, 2026
Security & Compliance

How to Whitelist a Domain in Office 365: Microsoft 365 Defender and Exchange Online Guide

Quick answer: To whitelist a domain in Office 365, open the Microsoft Defender portal, go to Email & collaboration > Policies & rules > Threat policies > Tenant Allow/Block...

March 20, 2026
Microsoft 365

How to Add a Custom Domain to Microsoft 365: Step-by-Step Guide

Adding a custom domain to Microsoft 365 allows your organization to use professional email addresses such as user@yourcompany.com instead of the default user@tenant.onmicrosoft.com address. This is one of the...

Microsoft Defender for Business Overview

May 20, 2025
Security & Compliance

Microsoft Defender for Business: Complete 2026 Guide for SMB Endpoint Security

Cybersecurity is no longer only a large enterprise problem. Small and medium businesses are now common targets because attackers know many SMBs have limited IT staff, limited security tooling,...

April 10, 2026
Security & Compliance

How to Send Encrypted Email in Outlook: Desktop, Web, New Outlook & Microsoft 365 Guide

Sending confidential information through email is common, but it also comes with risk. If you are sharing contracts, financial records, HR documents, customer information, legal files, or any sensitive...

May 27, 2026
Security & Compliance

How to Create and Manage Microsoft Attack simulation training in Microsoft 365 (2026)

Phishing is still one of the easiest ways for attackers to get inside a business. Microsoft says it screens 5 billion emails every day for threats like malware and...