--- title: Mail Filtering Best Practices | Microsoft 365 description: Best practices for configuring Microsoft 365 mail flow rules to block spam, phishing, and malicious content, ensuring your organization stays secure. --- [Skip to content](https://bitlyft.com/microsoft-365-mail-filtering#main-content) [![BitLyft Cybersecurity](https://bitlyft.com/hubfs/BitLyft-header-logo.svg)](https://www.bitlyft.com/) - Solutions Show submenu for Solutions - [BitLyft True MDR](https://www.bitlyft.com/agentic-mdr) Show submenu for BitLyft True MDR - [What is AMDR?](https://www.bitlyft.com/solutions/what-is-amdr) - [Security Automation](https://www.bitlyft.com/security-automation) - [Security Operation Center (SOC)](https://www.bitlyft.com/security-operations-center-soc) - [SIEM Management](https://www.bitlyft.com/security-information-and-event-management-siem) - [Central Threat Intelligence](https://www.bitlyft.com/central-threat-intelligence) - [BitLyft AIR®](https://www.bitlyft.com/air) - Industries Show submenu for Industries - [Banking](https://www.bitlyft.com/cybersecurity-for-banks) - [Public Utilities](https://www.bitlyft.com/managed-detection-and-response-for-public-utilities) - [DoD (CMMC)](https://www.bitlyft.com/cmmc-cybersecurity-compliance) - [NIST 800 - 171](https://www.bitlyft.com/nist-800-171) - [Healthcare](https://www.bitlyft.com/healthcare-cybersecurity) - [Higher Education](https://www.bitlyft.com/higher-education-cybersecurity) - [AI Data Center Security](https://www.bitlyft.com/ai-data-center-security) - [Cybersecurity for Aerospace](https://www.bitlyft.com/cybersecurity-for-aerospace) - [Energy and Utilities](https://www.bitlyft.com/energy-utilities-cybersecurity) - [Pricing](https://www.bitlyft.com/agentic-managed-detection-response-pricing) - [Partners](https://www.bitlyft.com/partners) - Company Show submenu for Company - [About Us](https://www.bitlyft.com/about-us) - [Careers](https://www.bitlyft.com/careers) - [Contact Us](https://www.bitlyft.com/contact-us) - Resources Show submenu for Resources - [Blog](https://www.bitlyft.com/resources) - [Case Studies](https://www.bitlyft.com/case-studies) - [Downloads](https://www.bitlyft.com/downloads) - [Glossary](https://www.bitlyft.com/glossary-of-terms) - [Experienced a Breach?](https://bitlyft.com/emergency-incident-response) Open main navigation Close main navigation - Solutions Show submenu for Solutions - [BitLyft True MDR](https://www.bitlyft.com/agentic-mdr) Show submenu for BitLyft True MDR - [What is AMDR?](https://www.bitlyft.com/solutions/what-is-amdr) - [Security Automation](https://www.bitlyft.com/security-automation) - [Security Operation Center (SOC)](https://www.bitlyft.com/security-operations-center-soc) - [SIEM Management](https://www.bitlyft.com/security-information-and-event-management-siem) - [Central Threat Intelligence](https://www.bitlyft.com/central-threat-intelligence) - [BitLyft AIR®](https://www.bitlyft.com/air) - Industries Show submenu for Industries - [Banking](https://www.bitlyft.com/cybersecurity-for-banks) - [Public Utilities](https://www.bitlyft.com/managed-detection-and-response-for-public-utilities) - [DoD (CMMC)](https://www.bitlyft.com/cmmc-cybersecurity-compliance) - [NIST 800 - 171](https://www.bitlyft.com/nist-800-171) - [Healthcare](https://www.bitlyft.com/healthcare-cybersecurity) - [Higher Education](https://www.bitlyft.com/higher-education-cybersecurity) - [AI Data Center Security](https://www.bitlyft.com/ai-data-center-security) - [Cybersecurity for Aerospace](https://www.bitlyft.com/cybersecurity-for-aerospace) - [Energy and Utilities](https://www.bitlyft.com/energy-utilities-cybersecurity) - [Pricing](https://www.bitlyft.com/agentic-managed-detection-response-pricing) - [Partners](https://www.bitlyft.com/partners) - Company Show submenu for Company - [About Us](https://www.bitlyft.com/about-us) - [Careers](https://www.bitlyft.com/careers) - [Contact Us](https://www.bitlyft.com/contact-us) - Resources Show submenu for Resources - [Blog](https://www.bitlyft.com/resources) - [Case Studies](https://www.bitlyft.com/case-studies) - [Downloads](https://www.bitlyft.com/downloads) - [Glossary](https://www.bitlyft.com/glossary-of-terms) - [Experienced a Breach?](https://bitlyft.com/emergency-incident-response) - [Request a Demo](https://www.bitlyft.com/request-a-demo) [Request a Demo](https://www.bitlyft.com/request-a-demo) # Microsoft 365 Mail Filtering Best Practices Guide In this expert guide, we share actionable best practices for configuring Microsoft 365 mail flow rules to block spam, phishing attempts, malicious attachments, and spoofed senders. These are real-world recommendations we’ve developed while securing organizations just like yours. [Learn more](https://www.drivewebstudio.com/) ### M365 Mail Filtering Guide [![Group 1000001766](https://bitlyft.com/hubfs/Group%201000001766.svg "Group 1000001766")](https://www.bitlyft.com) [BitLyft AIR®](https://www.bitlyft.com/air) [Agentic MDR](https://www.bitlyft.com/agentic-mdr) [Partner](https://www.bitlyft.com/partners) [Privacy Policy](https://www.bitlyft.com/privacy-policy) [Careers](https://www.bitlyft.com/careers) [Blog](https://www.bitlyft.com/resources) [White Papers](https://www.bitlyft.com/downloads) [Use Cases](https://www.bitlyft.com/case-studies) [Miller Mindset Podcast](https://www.youtube.com/playlist?list=PLz7CtIA5QhhJgjIo3CUpdm7gm3Th6mrcm) [About Us](https://www.bitlyft.com/about-us) [Contact Us](https://www.bitlyft.com/contact-us) [News](https://www.bitlyft.com/news) [Get A Quote](https://www.bitlyft.com/get-a-quote) [facebook-f icon](https://www.facebook.com/BitLyft) [linkedin-in icon](https://www.linkedin.com/company/bitlyft/) [twitter icon](https://twitter.com/bitlyft) [youtube icon](https://www.youtube.com/channel/UCGMnF3PMXFgTotrnPJfC87w) Copyright © 2026, BitLyft Cybersecurity [![BitLyft Cybersecurity](https://bitlyft.com/hubfs/BitLyft-header-logo.svg)](https://www.bitlyft.com) Solutions [FeaturedBitLyft AIR® Autonomous SOC — detection, response & remediation on autopilot, around the clock. Explore the platform](https://www.bitlyft.com/air) Our Solutions [BitLyft Agentic MDRFully managed detection & response](https://www.bitlyft.com/agentic-mdr) [Security AutomationAutomate the busywork of defense](https://www.bitlyft.com/security-automation) [Security Operations Center24/7 SOC coverage](https://www.bitlyft.com/security-operations-center-soc) [SIEM ManagementTuned, managed & monitored](https://www.bitlyft.com/security-information-and-event-management-siem) [Central Threat IntelligenceShared signal across customers](https://www.bitlyft.com/central-threat-intelligence) [BitLyft AIR®Automated incident response](https://www.bitlyft.com/air) [What is AMDR?](https://www.bitlyft.com/solutions/what-is-amdr) [What is an ISOC?](https://www.bitlyft.com/solutions/what-is-isoc) [Plans & pricing](https://www.bitlyft.com/pricing) [Compare MDR vs. AIR NEW](https://www.bitlyft.com/true-mdr) Industries [Compliance-readyDoD & CMMC Meet CMMC and NIST 800-171 with security operations built for regulated sectors. See compliance coverage](https://www.bitlyft.com/cmmc) Industries we protect [Banking](https://www.bitlyft.com/banking) [FinTech](https://www.bitlyft.com/managed-detection-and-response-for-fintech) [Public Utilities](https://www.bitlyft.com/managed-detection-and-response-for-public-utilities) [DoD (CMMC)](https://www.bitlyft.com/cmmc) [NIST 800-171](https://www.bitlyft.com/nist-800-171) [Healthcare](https://www.bitlyft.com/managed-detection-and-response-for-healthcare) [Higher Education](https://www.bitlyft.com/higher-education) [AI Data Center Security](https://www.bitlyft.com/ai-data-center-security) [Cybersecurity for Aerospace](https://www.bitlyft.com/cybersecurity-for-aerospace) [Energy & Utilities](https://www.bitlyft.com/energy-and-utilities) [Manufacturing](https://www.bitlyft.com/agentic-mdr-for-manufacturing) [Pricing](https://www.bitlyft.com/pricing) [Partners](https://www.bitlyft.com/partners) Company [Who we areAbout BitLyft On a mission to make elite cybersecurity accessible to every organization. Our story](https://www.bitlyft.com/about-us) Company [About Us](https://www.bitlyft.com/about-us) [Careers](https://www.bitlyft.com/careers) [Contact Us](https://www.bitlyft.com/contact-us) Resources [LearnBitLyft Blog Threat research, how-to guides and security insights from our SOC team. Read the blog](https://www.bitlyft.com/resources) Resources [Blog](https://www.bitlyft.com/resources) [Newsroom](https://www.bitlyft.com/news) [Case Studies](https://www.bitlyft.com/case-studies) [Downloads](https://www.bitlyft.com/downloads) [Glossary](https://www.bitlyft.com/glossary-of-terms) [Experienced a Breach?](https://bitlyft.com/emergency-incident-response) [Request a Demo](https://www.bitlyft.com/request-a-demo) [Request a Demo](https://www.bitlyft.com/request-a-demo)