Email Filtering

Email filtering is the process of evaluating an organization’s inbound and outbound email traffic and determining what to permit and what to deny. Inbound filtering can scan and then organize messages into different categories before delivery to the user’s inbox. Outbound filtering can use the same process before delivering any potentially harmful messages to another organization.

AT&T Cybersecurity – Boundary Defense with Sender Policy Framework
This resource provides a list of free and commercial tools for implementing SPF.
CSO – What are DMARC, SPF and DKIM? How to master email security with these protocols
This article explains the difference DMARC, SPF and DKIM and how to use them to secure you email environment
Fortinet – Spam Filtering
Learn about spam filters, how they work, why they exist, and how to avoid being filtered.
Microsoft – Anti-spam protection in EOP
This document provides anti-spam options information for Office 365 administrators.
Protecting Against Spam and Phishing Attacks With a Layered Approach to Email Security
This article from SecurityIntelligence discusses how organizations can take a layered approach to combat spam and phishing.
SpamTitan – Best Spam Filter for Business
This article looks at the different types of spam filter and the deployment options available.

CMMC Level 1 Assessment Guide
This document provides assessment guidance for conducting Cybersecurity Maturity Model Certification (CMMC) assessments for Level 1.
CMMC Level 2 Assessment Guide
This document provides assessment guidance for conducting Cybersecurity Maturity Model Certification (CMMC) assessments for Level 2.
NIST SP 800-171A Assessing Security Requirements for Controlled Unclassified Information
The purpose of this publication is to provide procedures for assessing the CUI requirements in NIST Special Publication 800-171.

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