{"id":1084,"date":"2019-11-06T14:22:43","date_gmt":"2019-11-06T19:22:43","guid":{"rendered":"https:\/\/ndisac.org\/dev\/dibscc\/?p=1084"},"modified":"2025-05-16T13:24:28","modified_gmt":"2025-05-16T18:24:28","slug":"email-filtering","status":"publish","type":"post","link":"https:\/\/ndisac.org\/dibscc\/implementation-and-assessment\/top-10-high-value-controls\/email-filtering\/","title":{"rendered":"Email Filtering"},"content":{"rendered":"<p>[et_pb_section fb_built=&#8221;1&#8243; _builder_version=&#8221;3.22&#8243;][et_pb_row _builder_version=&#8221;4.0.6&#8243;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.0.6&#8243;][et_pb_text admin_label=&#8221;Add Description Here&#8221; _builder_version=&#8221;4.4.3&#8243; vertical_offset_tablet=&#8221;0&#8243; horizontal_offset_tablet=&#8221;0&#8243; z_index_tablet=&#8221;500&#8243; text_text_shadow_horizontal_length_tablet=&#8221;0px&#8221; text_text_shadow_vertical_length_tablet=&#8221;0px&#8221; text_text_shadow_blur_strength_tablet=&#8221;1px&#8221; link_text_shadow_horizontal_length_tablet=&#8221;0px&#8221; link_text_shadow_vertical_length_tablet=&#8221;0px&#8221; link_text_shadow_blur_strength_tablet=&#8221;1px&#8221; ul_text_shadow_horizontal_length_tablet=&#8221;0px&#8221; ul_text_shadow_vertical_length_tablet=&#8221;0px&#8221; ul_text_shadow_blur_strength_tablet=&#8221;1px&#8221; ol_text_shadow_horizontal_length_tablet=&#8221;0px&#8221; ol_text_shadow_vertical_length_tablet=&#8221;0px&#8221; ol_text_shadow_blur_strength_tablet=&#8221;1px&#8221; quote_text_shadow_horizontal_length_tablet=&#8221;0px&#8221; quote_text_shadow_vertical_length_tablet=&#8221;0px&#8221; quote_text_shadow_blur_strength_tablet=&#8221;1px&#8221; header_text_shadow_horizontal_length_tablet=&#8221;0px&#8221; header_text_shadow_vertical_length_tablet=&#8221;0px&#8221; header_text_shadow_blur_strength_tablet=&#8221;1px&#8221; header_2_text_shadow_horizontal_length_tablet=&#8221;0px&#8221; header_2_text_shadow_vertical_length_tablet=&#8221;0px&#8221; header_2_text_shadow_blur_strength_tablet=&#8221;1px&#8221; header_3_text_shadow_horizontal_length_tablet=&#8221;0px&#8221; header_3_text_shadow_vertical_length_tablet=&#8221;0px&#8221; header_3_text_shadow_blur_strength_tablet=&#8221;1px&#8221; header_4_text_shadow_horizontal_length_tablet=&#8221;0px&#8221; header_4_text_shadow_vertical_length_tablet=&#8221;0px&#8221; header_4_text_shadow_blur_strength_tablet=&#8221;1px&#8221; header_5_text_shadow_horizontal_length_tablet=&#8221;0px&#8221; header_5_text_shadow_vertical_length_tablet=&#8221;0px&#8221; header_5_text_shadow_blur_strength_tablet=&#8221;1px&#8221; header_6_text_shadow_horizontal_length_tablet=&#8221;0px&#8221; header_6_text_shadow_vertical_length_tablet=&#8221;0px&#8221; header_6_text_shadow_blur_strength_tablet=&#8221;1px&#8221; box_shadow_horizontal_tablet=&#8221;0px&#8221; box_shadow_vertical_tablet=&#8221;0px&#8221; box_shadow_blur_tablet=&#8221;40px&#8221; box_shadow_spread_tablet=&#8221;0px&#8221;]Email filtering is the process of evaluating an organization\u2019s 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&#8217;s inbox. Outbound filtering can use the same process before delivering any potentially harmful messages to another organization.<br \/>\n[\/et_pb_text][et_pb_text _builder_version=&#8221;4.9.2&#8243; _module_preset=&#8221;default&#8221; hover_enabled=&#8221;0&#8243; locked=&#8221;off&#8221; sticky_enabled=&#8221;0&#8243;]\n\t\t\t<div class='et-tabs-container et_sliderfx_fade et_sliderauto_false et_sliderauto_speed_5000 et_slidertype_top_tabs'>\n\t\t\t\t<p>\n\t\t<ul class='et-tabs-control'>\n\t\t\t<li><a href='#'>\n\t\t\tStandards\n\t\t<\/a><\/li>\n\n\t\t<li><a href='#'>\n\t\t\tImplementation \/ Use Cases\n\t\t<\/a><\/li>\n\n\t\t<li><a href='#'>\n\t\t\tIndustry Best Practices\n\t\t<\/a><\/li>\n\n\t\t<li><a href='#'>\n\t\t\tExample Tools \/ Policies\n\t\t<\/a><\/li>\n\n\t\t<li><a href='#'>\n\t\t\tCMMC Readiness\n\t\t<\/a><\/li>\n\t\t<\/ul> <!-- .et-tabs-control -->\n\n\t\t<div class='et-tabs-content'>\n\t\t\t<div class='et-tabs-content-main-wrap'>\n\t\t\t\t<div class='et-tabs-content-wrapper'>\n\t\t\t\t\t<div class='et_slidecontent'>\n\t\t\t<p class=\"p1\"><span class=\"s1\"><!-- Beginning of Link Library Output --><div id='linklist1' class='linklist'><!-- Div Linklist -->\n<div class=\"LinkLibraryCat LinkLibraryCat615 level0\"><!-- Div Category -->\n\t<ul>\n<li><a href=\"https:\/\/nvlpubs.nist.gov\/nistpubs\/SpecialPublications\/NIST.SP.800-177r1.pdf\" id=\"link-14604\" class=\"track_this_link \" rel=\"noopener noreferrer\" target=\"_blank\">NIST SP 800-177 Rev 1: Trustworthy Email<\/a>\n<p>This document gives recommendations and guidelines for enhancing trust in email. The primary \r\naudience includes enterprise email administrators, information security specialists and network \r\nmanagers. This guideline applies to federal IT systems and will also be useful for small or \r\nmedium sized organizations.<\/p><\/li>\n<li><a href=\"https:\/\/csrc.nist.gov\/projects\/cprt\/catalog#\/cprt\/framework\/version\/SP_800_53_5_1_1\/home?element=SI-08\" id=\"link-14620\" class=\"track_this_link \" rel=\"noopener noreferrer\" target=\"_blank\">NIST SP 800-53 Rev 5: SI-8 Spam Protection<\/a>\n<p>NIST resource that defines the requirements for spam protection.<\/p><\/li>\n\t<\/ul>\n<\/div><!-- Div End Category -->\n<script type='text\/javascript'>\njQuery(document).ready(function()\n{\njQuery('.arrow-up').hide();\njQuery('#linklist1 a.track_this_link').click(function() {\nlinkid = this.id;\nlinkid = linkid.substring(5);\npath = '';\njQuery.ajax( {    type: 'POST',    url: 'https:\/\/ndisac.org\/dibscc\/wp-admin\/admin-ajax.php',     data: { action: 'link_library_tracker',             _ajax_nonce: 'a6f209b022',             id:linkid, xpath:path }     });\nreturn true;\n});\njQuery('#linklist1 .expandlinks').click(function() {\ntarget = '.' + jQuery(this).attr('id');\nsubcattarget = '.' + jQuery(this).attr('data-subcat');\nif ( jQuery( target ).is(':visible') ) {\njQuery(target).slideUp();\njQuery(subcattarget).slideToggle();\njQuery(this).children('img').attr('src', 'https:\/\/ndisac.org\/dibscc\/wp-content\/plugins\/link-library\/icons\/expand-32.png');\n} else {\njQuery(target).slideDown();\njQuery(subcattarget).slideToggle();\njQuery(this).children('img').attr('src', 'https:\/\/ndisac.org\/dibscc\/wp-content\/plugins\/link-library\/icons\/collapse-32.png');\n}\n});\njQuery('#linklist1 .linklistcatclass').click(function() {\njQuery(this).siblings('.expandlinks').click();\n});\njQuery('#linklist1 .linklistcatnamedesc').click(function() {\njQuery(this).siblings('.expandlinks').click();\n});\n});\n<\/script>\n<\/div><!-- Div Linklist -->\n<!-- End of Link Library Output -->\n\t\t<\/div>\n\n\t\t<div class='et_slidecontent'>\n\t\t\t<p class=\"p1\"><span class=\"s1\"><!-- Beginning of Link Library Output --><div id='linklist1' class='linklist'><!-- Div Linklist -->\n<div class=\"LinkLibraryCat LinkLibraryCat616 level0\"><!-- Div Category -->\n\t<ul>\n<li><a href=\"https:\/\/www.csoonline.com\/article\/564563\/mastering-email-security-with-dmarc-spf-and-dkim.html\" id=\"link-6336\" class=\"track_this_link \" rel=\"noopener noreferrer\" target=\"_blank\">CSO &#8211; What are DMARC, SPF and DKIM? How to master email security with these protocols<\/a>\n<p>This article explains the difference DMARC, SPF and DKIM and how to use them to secure you email environment<\/p><\/li>\n<li><a href=\"https:\/\/www.fortinet.com\/resources\/cyberglossary\/spam-filters\" id=\"link-6068\" class=\"track_this_link \" rel=\"noopener noreferrer\" target=\"_blank\">Fortinet &#8211; Spam Filtering<\/a>\n<p>Learn about spam filters, how they work, why they exist, and how to avoid being filtered.<\/p><\/li>\n<li><a href=\"https:\/\/www.proofpoint.com\/us\/threat-reference\/email-filtering\" id=\"link-14600\" class=\"track_this_link \" rel=\"noopener noreferrer\" target=\"_blank\">proofpoint &#8211; What is Email Filtering?<\/a>\n<p>This article explains the definition, appliances, email filtering techniques, and solutions.<\/p><\/li>\n\t<\/ul>\n<\/div><!-- Div End Category -->\n<script type='text\/javascript'>\njQuery(document).ready(function()\n{\njQuery('.arrow-up').hide();\njQuery('#linklist1 a.track_this_link').click(function() {\nlinkid = this.id;\nlinkid = linkid.substring(5);\npath = '';\njQuery.ajax( {    type: 'POST',    url: 'https:\/\/ndisac.org\/dibscc\/wp-admin\/admin-ajax.php',     data: { action: 'link_library_tracker',             _ajax_nonce: 'a6f209b022',             id:linkid, xpath:path }     });\nreturn true;\n});\njQuery('#linklist1 .expandlinks').click(function() {\ntarget = '.' + jQuery(this).attr('id');\nsubcattarget = '.' + jQuery(this).attr('data-subcat');\nif ( jQuery( target ).is(':visible') ) {\njQuery(target).slideUp();\njQuery(subcattarget).slideToggle();\njQuery(this).children('img').attr('src', 'https:\/\/ndisac.org\/dibscc\/wp-content\/plugins\/link-library\/icons\/expand-32.png');\n} else {\njQuery(target).slideDown();\njQuery(subcattarget).slideToggle();\njQuery(this).children('img').attr('src', 'https:\/\/ndisac.org\/dibscc\/wp-content\/plugins\/link-library\/icons\/collapse-32.png');\n}\n});\njQuery('#linklist1 .linklistcatclass').click(function() {\njQuery(this).siblings('.expandlinks').click();\n});\njQuery('#linklist1 .linklistcatnamedesc').click(function() {\njQuery(this).siblings('.expandlinks').click();\n});\n});\n<\/script>\n<\/div><!-- Div Linklist -->\n<!-- End of Link Library Output -->\n\t\t<\/div>\n\n\t\t<div class='et_slidecontent'>\n\t\t\t<p class=\"p1\"><span class=\"s1\"><!-- Beginning of Link Library Output --><div id='linklist1' class='linklist'><!-- Div Linklist -->\n<div class=\"LinkLibraryCat LinkLibraryCat617 level0\"><!-- Div Category -->\n\t<ul>\n<li><a href=\"https:\/\/www.checkpoint.com\/cyber-hub\/threat-prevention\/what-is-email-security\/\" id=\"link-6067\" class=\"track_this_link \" rel=\"noopener noreferrer\" target=\"_blank\">Check Point &#8211; What is Email Security:<\/a>\n<p>Email is a common target of cyberattacks due to its ubiquity and the relative ease of crafting a phishing campaign compared to other cyber threats. Protecting against the ever-evolving email threat requires advanced email security solutions.<\/p><\/li>\n<li><a href=\"https:\/\/learn.microsoft.com\/en-us\/defender-office-365\/anti-spam-protection-about?view=o365-worldwide\" id=\"link-6069\" class=\"track_this_link \" rel=\"noopener noreferrer\" target=\"_blank\">Microsoft &#8211; Anti-spam protection in EOP<\/a>\n<p>This document provides anti-spam options information for Office 365 administrators.<\/p><\/li>\n\t<\/ul>\n<\/div><!-- Div End Category -->\n<script type='text\/javascript'>\njQuery(document).ready(function()\n{\njQuery('.arrow-up').hide();\njQuery('#linklist1 a.track_this_link').click(function() {\nlinkid = this.id;\nlinkid = linkid.substring(5);\npath = '';\njQuery.ajax( {    type: 'POST',    url: 'https:\/\/ndisac.org\/dibscc\/wp-admin\/admin-ajax.php',     data: { action: 'link_library_tracker',             _ajax_nonce: 'a6f209b022',             id:linkid, xpath:path }     });\nreturn true;\n});\njQuery('#linklist1 .expandlinks').click(function() {\ntarget = '.' + jQuery(this).attr('id');\nsubcattarget = '.' + jQuery(this).attr('data-subcat');\nif ( jQuery( target ).is(':visible') ) {\njQuery(target).slideUp();\njQuery(subcattarget).slideToggle();\njQuery(this).children('img').attr('src', 'https:\/\/ndisac.org\/dibscc\/wp-content\/plugins\/link-library\/icons\/expand-32.png');\n} else {\njQuery(target).slideDown();\njQuery(subcattarget).slideToggle();\njQuery(this).children('img').attr('src', 'https:\/\/ndisac.org\/dibscc\/wp-content\/plugins\/link-library\/icons\/collapse-32.png');\n}\n});\njQuery('#linklist1 .linklistcatclass').click(function() {\njQuery(this).siblings('.expandlinks').click();\n});\njQuery('#linklist1 .linklistcatnamedesc').click(function() {\njQuery(this).siblings('.expandlinks').click();\n});\n});\n<\/script>\n<\/div><!-- Div Linklist -->\n<!-- End of Link Library Output -->\n\t\t<\/div>\n\n\t\t<div class='et_slidecontent'>\n\t\t\t<p class=\"p1\"><span class=\"s1\"><!-- Beginning of Link Library Output --><div id='linklist1' class='linklist'><!-- Div Linklist -->\n<div class=\"LinkLibraryCat LinkLibraryCat618 level0\"><!-- Div Category -->\n\t<ul>\n<li><a href=\"https:\/\/www.gartner.com\/reviews\/market\/email-security-platforms\" id=\"link-6338\" class=\"track_this_link \" rel=\"noopener noreferrer\" target=\"_blank\">Gartner \u2013 Email Security Platforms Reviews and Ratings<\/a>\n<p>This resource provides a list and reviews of products in the email security platform market.<\/p><\/li>\n<li><a href=\"https:\/\/www.spamtitan.com\/best-spam-filter-for-business\/\" id=\"link-6071\" class=\"track_this_link \" rel=\"noopener noreferrer\" target=\"_blank\">SpamTitan &#8211; Best Spam Filter for Business<\/a>\n<p>This article looks at the different types of spam filter and the deployment options available.<\/p><\/li>\n\t<\/ul>\n<\/div><!-- Div End Category -->\n<script type='text\/javascript'>\njQuery(document).ready(function()\n{\njQuery('.arrow-up').hide();\njQuery('#linklist1 a.track_this_link').click(function() {\nlinkid = this.id;\nlinkid = linkid.substring(5);\npath = '';\njQuery.ajax( {    type: 'POST',    url: 'https:\/\/ndisac.org\/dibscc\/wp-admin\/admin-ajax.php',     data: { action: 'link_library_tracker',             _ajax_nonce: 'a6f209b022',             id:linkid, xpath:path }     });\nreturn true;\n});\njQuery('#linklist1 .expandlinks').click(function() {\ntarget = '.' + jQuery(this).attr('id');\nsubcattarget = '.' + jQuery(this).attr('data-subcat');\nif ( jQuery( target ).is(':visible') ) {\njQuery(target).slideUp();\njQuery(subcattarget).slideToggle();\njQuery(this).children('img').attr('src', 'https:\/\/ndisac.org\/dibscc\/wp-content\/plugins\/link-library\/icons\/expand-32.png');\n} else {\njQuery(target).slideDown();\njQuery(subcattarget).slideToggle();\njQuery(this).children('img').attr('src', 'https:\/\/ndisac.org\/dibscc\/wp-content\/plugins\/link-library\/icons\/collapse-32.png');\n}\n});\njQuery('#linklist1 .linklistcatclass').click(function() {\njQuery(this).siblings('.expandlinks').click();\n});\njQuery('#linklist1 .linklistcatnamedesc').click(function() {\njQuery(this).siblings('.expandlinks').click();\n});\n});\n<\/script>\n<\/div><!-- Div Linklist -->\n<!-- End of Link Library Output -->\n\t\t<\/div>\n\n\t\t<div class='et_slidecontent'>\n\t\t\tCMMC Related Controls<\/p>\n<ul>\n<li>Level 1 | <a href=\"https:\/\/ndisac.org\/dibscc\/cyberassist\/cybersecurity-maturity-model-certification\/level-2\/si-l2-3-14-5\/\">SI.L1-3.14.5 \u2013 System &amp; File Scanning: Perform periodic scans of the information system and real-time scans of files from external sources as files are downloaded, opened, or executed.<\/a><\/li>\n<\/ul>\n<p>CMMC Assessment Guides<\/p>\n<p class=\"p1\"><span class=\"s1\"><!-- Beginning of Link Library Output --><div id='linklist1' class='linklist'><!-- Div Linklist -->\n<div class=\"LinkLibraryCat LinkLibraryCat671 level0\"><!-- Div Category -->\n\t<ul>\n<li><a href=\"https:\/\/dodcio.defense.gov\/Portals\/0\/Documents\/CMMC\/AssessmentGuideL1v2.pdf\" id=\"link-9988\" class=\"track_this_link \" rel=\"noopener noreferrer\" target=\"_blank\">CMMC Level 1 Self-Assessment Guide<\/a>\n<p>This document provides self-assessment guidance for conducting Cybersecurity Maturity Model Certification (CMMC) assessments for Level 1.<\/p>\n<\/li>\n<li><a href=\"https:\/\/dodcio.defense.gov\/Portals\/0\/Documents\/CMMC\/AssessmentGuideL2v2.pdf\" id=\"link-9989\" class=\"track_this_link \" rel=\"noopener noreferrer\" target=\"_blank\">CMMC Level 2 Assessment Guide<\/a>\n<p>This document provides assessment guidance for conducting Cybersecurity Maturity Model Certification (CMMC) assessments for Level 2.<\/p>\n<\/li>\n<li><a href=\"https:\/\/dodcio.defense.gov\/Portals\/0\/Documents\/CMMC\/AssessmentGuideL3v2.pdf\" id=\"link-14791\" class=\"track_this_link \" rel=\"noopener noreferrer\" target=\"_blank\">CMMC Level 3 Assessment Guide<\/a>\n<p>This document provides assessment guidance for conducting Cybersecurity Maturity Model Certification (CMMC) assessments for Level 3.<\/p>\n<\/li>\n\t<\/ul>\n<\/div><!-- Div End Category -->\n<script type='text\/javascript'>\njQuery(document).ready(function()\n{\njQuery('.arrow-up').hide();\njQuery('#linklist1 a.track_this_link').click(function() {\nlinkid = this.id;\nlinkid = linkid.substring(5);\npath = '';\njQuery.ajax( {    type: 'POST',    url: 'https:\/\/ndisac.org\/dibscc\/wp-admin\/admin-ajax.php',     data: { action: 'link_library_tracker',             _ajax_nonce: 'a6f209b022',             id:linkid, xpath:path }     });\nreturn true;\n});\njQuery('#linklist1 .expandlinks').click(function() {\ntarget = '.' + jQuery(this).attr('id');\nsubcattarget = '.' + jQuery(this).attr('data-subcat');\nif ( jQuery( target ).is(':visible') ) {\njQuery(target).slideUp();\njQuery(subcattarget).slideToggle();\njQuery(this).children('img').attr('src', 'https:\/\/ndisac.org\/dibscc\/wp-content\/plugins\/link-library\/icons\/expand-32.png');\n} else {\njQuery(target).slideDown();\njQuery(subcattarget).slideToggle();\njQuery(this).children('img').attr('src', 'https:\/\/ndisac.org\/dibscc\/wp-content\/plugins\/link-library\/icons\/collapse-32.png');\n}\n});\njQuery('#linklist1 .linklistcatclass').click(function() {\njQuery(this).siblings('.expandlinks').click();\n});\njQuery('#linklist1 .linklistcatnamedesc').click(function() {\njQuery(this).siblings('.expandlinks').click();\n});\n});\n<\/script>\n<\/div><!-- Div Linklist -->\n<!-- End of Link Library Output -->\n\n<\/span><\/p>\n\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t<\/div> <!-- .et-tabs-container -->[\/et_pb_text][\/et_pb_column][\/et_pb_row][\/et_pb_section]<\/p>\n","protected":false},"excerpt":{"rendered":"<p>[et_pb_section fb_built=&#8221;1&#8243; 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