{"id":56740,"date":"2020-06-18T16:17:08","date_gmt":"2020-06-18T20:17:08","guid":{"rendered":"https:\/\/www.inmotionhosting.com\/support\/?p=56740"},"modified":"2023-11-03T11:36:13","modified_gmt":"2023-11-03T15:36:13","slug":"rbl-whm","status":"publish","type":"post","link":"https:\/\/www.inmotionhosting.com\/support\/edu\/whm\/rbl-whm\/","title":{"rendered":"Real-time Blackhole Lists (RBLs) in WHM for Stronger Email Security"},"content":{"rendered":"<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"538\" src=\"https:\/\/www.inmotionhosting.com\/support\/wp-content\/uploads\/2023\/11\/Real-time-Blackhole-Lists-RBLs-in-WHM-for-Stronger-Email-Security-1024x538.png\" alt=\"Real-time Blackhole Lists (RBLs) in WHM for Stronger Email Security Hero Image\" class=\"wp-image-107750\" srcset=\"https:\/\/www.inmotionhosting.com\/support\/wp-content\/uploads\/2023\/11\/Real-time-Blackhole-Lists-RBLs-in-WHM-for-Stronger-Email-Security-1024x538.png 1024w, https:\/\/www.inmotionhosting.com\/support\/wp-content\/uploads\/2023\/11\/Real-time-Blackhole-Lists-RBLs-in-WHM-for-Stronger-Email-Security-300x158.png 300w, https:\/\/www.inmotionhosting.com\/support\/wp-content\/uploads\/2023\/11\/Real-time-Blackhole-Lists-RBLs-in-WHM-for-Stronger-Email-Security-768x403.png 768w, https:\/\/www.inmotionhosting.com\/support\/wp-content\/uploads\/2023\/11\/Real-time-Blackhole-Lists-RBLs-in-WHM-for-Stronger-Email-Security.png 1200w\" sizes=\"auto, (min-width: 1360px) 876px, (min-width: 960px) calc(61.58vw + 51px), calc(100vw - 80px)\" \/><\/figure>\n\n\n\n<p>Before we discuss Blackhole Lists (RBLs), we need to cover some background information regarding email security on a <a href=\"https:\/\/www.inmotionhosting.com\/cpanel-hosting\/vps-with-cpanel?utm_source=supportcenter&amp;utm_medium=link&amp;utm_campaign=supportcenter\">VPS with cPanel<\/a>. One of the first things a cPanel user should learn is how to block spam in cPanel with DNS records and prevent your emails from being marked as junk. Many guides cover a lot of automated technical controls that can stop more obvious spam. <em>But it\u2019s not enough.<\/em> <\/p>\n\n\n\n<p>Phishing has been a top three most reported breach method for the last five years, according to <a rel=\"noreferrer noopener\" href=\"https:\/\/enterprise.verizon.com\/resources\/reports\/dbir\/\" target=\"_blank\">Verizon\u2019s 2020 Data Breach Investigation Report (DBIR)<\/a>. That means more needs to be done to mitigate phishing and other Business Email Compromise (BEC) attacks. And there undoubtedly are cyber attackers who know how to spam with cPanel or bypass these controls.<\/p>\n\n\n\n<p>Blocking IP addresses from emailing your web server is another technical control to improve email security. WebHost Manager (WHM) allows multiple methods for this. The easiest is by country and domain. But with virtual private networks (VPNs) and proxy services (some free) being commonly used to bypass region restrictions, there\u2019s still a lot of room for improvement.<\/p>\n\n\n\n<p>A Real-time Blackhole List (RBL), or DNSBL, can help.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"#what\">What is a RBL?<\/a>\n<ul class=\"wp-block-list\">\n<li><a href=\"#where\">Where are RBLs?<\/a><\/li>\n\n\n\n<li><a href=\"#how\">How to add RBLs in WHM<\/a><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"what\">What is a Real-time Blackhole List (RBL)?<\/h2>\n\n\n\n<p>Sometimes used interchangeably with <em>blacklist<\/em>, a RBL is a list of IP addresses and domains that are known or suspected to be used for malicious purposes. That includes multiple factors:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Newly registered domains<\/li>\n\n\n\n<li>IPs with a bad DNS reputation<\/li>\n\n\n\n<li>IPs sending emails with faulty headers<\/li>\n<\/ul>\n\n\n\n<p>Your specific needs determine what types of RBLs and how many you should use. Remember, the biggest advantages to implementing RBLs are:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>You don\u2019t have to manually maintain the list<\/li>\n\n\n\n<li>The work is done before it reaches the end user<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"where\">Where are RBLs?<\/h3>\n\n\n\n<p>There are multiple 3rd party RBLs available online. WHM includes Spamhaus.org and SpamCop.net by default. For additional RBLs, check out Talos Intelligence IP blacklist and SpamEatingMonkey. Only enable one RBL within a few hours to help you spot and troubleshoot any legit emails being blocked. Auditing your Exim logs can help you troubleshoot false positives as well.<\/p>\n\n\n\n<p class=\"alert alert-warning\">Remember, these are third party vendors. Research what these vendors do with the information they receive and requirements to use their blacklists before implementing their databases with your email server environment.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"how\">How to Add a Custom RBL in WHM<\/h3>\n\n\n\n<p>Below we\u2019ll cover how to add a custom RBL in WHM. We\u2019ll use the SpamEatingMonkey Black RBL in our example but the steps in WHM are the same for any others you find elsewhere.<\/p>\n\n\n\n<ol class=\"article_list wp-block-list\">\n<li><a href=\"https:\/\/www.inmotionhosting.com\/support\/edu\/whm\/log-into-whm\/\">Log into WHM<\/a>.<\/li>\n\n\n\n<li>On the left, select <strong>Exim Configuration Manager<\/strong>.<\/li>\n\n\n\n<li>Select the <strong>RBLs<\/strong> tab.<\/li>\n\n\n\n<li>Select <strong>Manage Custom RBLs<\/strong>.<\/li>\n\n\n\n<li>Under <em>Add a new RBL<\/em>, for <strong>Rbl Name<\/strong>, create a name that will help you identify it.<br><figure><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"158\" src=\"https:\/\/www.inmotionhosting.com\/support\/wp-content\/uploads\/2020\/06\/whm-rbl-sem-black-1024x158.png\" alt=\"Add SEM Black Real-time Blackhole List (RBL) in WHM\" class=\"wp-image-56742\" srcset=\"https:\/\/www.inmotionhosting.com\/support\/wp-content\/uploads\/2020\/06\/whm-rbl-sem-black-1024x158.png 1024w, https:\/\/www.inmotionhosting.com\/support\/wp-content\/uploads\/2020\/06\/whm-rbl-sem-black-300x46.png 300w, https:\/\/www.inmotionhosting.com\/support\/wp-content\/uploads\/2020\/06\/whm-rbl-sem-black-768x118.png 768w, https:\/\/www.inmotionhosting.com\/support\/wp-content\/uploads\/2020\/06\/whm-rbl-sem-black.png 1300w\" sizes=\"auto, (min-width: 1360px) 876px, (min-width: 960px) calc(61.58vw + 51px), calc(100vw - 80px)\" \/><\/figure><div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><\/figure><\/div><\/li>\n\n\n\n<li>(Optional) Add a <strong>Rbl Info URL<\/strong> for a webpage that provides additional information about the database.<\/li>\n\n\n\n<li>Add the actual RBL link for <strong>Dns List<\/strong>.<\/li>\n\n\n\n<li>Select <strong>Add<\/strong> to be taken to a notification page directing you to enable it in your Configuration Editor, then rebuild your Exim config.<\/li>\n\n\n\n<li>Select <strong>Configuration Editor<\/strong> to return to <em>Manage Custom RBLs<\/em>.<\/li>\n\n\n\n<li>Select <strong>RBLs<\/strong>.<\/li>\n\n\n\n<li>To right of Custom RBL: [YourNewRBL], select <strong>On<\/strong>.<\/li>\n\n\n\n<li>Select <strong>Save<\/strong> to rebuild Exim.<\/li>\n<\/ol>\n\n\n\n<p>Again, adding Real-time Blackhole Lists is just one of many ways to <em>mitigate<\/em>, not prevent, phishing attacks. There are many other ways to harden your managed VPS or dedicated server. Security awareness training is required to fight more clever phishing and social engineering attacks such as the \u201c<a href=\"https:\/\/www.inmotionhosting.com\/support\/email\/scam-email-on-this-day-i-hacked-your-os\/\">On this day I hacked your OS<\/a>\u201d scam email. Let us know what RBLs you use to protect your email server below.<\/p>\n\n\n\n<p>Learn more about managing cPanel accounts with with Managed VPS Hosting Product Guide.<\/p>\n\n\n<div class=\"jumbotron\"><p style=\"margin-top:0;\"><img decoding=\"async\" src=\"https:\/\/design.inmotionhosting.com\/assets\/icons\/custom\/security.svg\" align=\"right\" alt=\"Secure VPS Hosting\" height=\"80\">Enjoy high-performance, lightning-fast servers with increased security and maximum up-time with our <a href=\"https:\/\/www.inmotionhosting.com\/vps-hosting\">Secure VPS Hosting<\/a>!<\/p>\r\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/design.inmotionhosting.com\/assets\/icons\/standard\/check-blue.svg\" alt=\"check mark\" width=\"24\" height=\"24\" \/>Linux VPS    <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/design.inmotionhosting.com\/assets\/icons\/standard\/check-blue.svg\" alt=\"check mark\" width=\"24\" height=\"24\" \/>cPanel or Control Web Panel    <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/design.inmotionhosting.com\/assets\/icons\/standard\/check-blue.svg\" alt=\"check mark\" width=\"24\" height=\"24\" \/>Scalable    <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/design.inmotionhosting.com\/assets\/icons\/standard\/check-blue.svg\" alt=\"check mark\" width=\"24\" height=\"24\" \/>Website Migration Assistance<\/p>\r\n<p style=\"margin:10px 0;\"><a class=\"btn btn-primary btn-lg\" href=\"https:\/\/www.inmotionhosting.com\/vps-hosting\/linux-vps\">Linux VPS Hosting<\/a><\/p><\/div>\n","protected":false},"excerpt":{"rendered":"<p>Before we discuss Blackhole Lists (RBLs), we need to cover some background information regarding email security on a VPS with cPanel. One of the first things a cPanel user should learn is how to block spam in cPanel with DNS records and prevent your emails from being marked as junk. Many guides cover a lot<a class=\"moretag\" href=\"https:\/\/www.inmotionhosting.com\/support\/edu\/whm\/rbl-whm\/\"> Read More ><\/a><\/p>\n","protected":false},"author":57014,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[4289],"tags":[],"class_list":["post-56740","post","type-post","status-publish","format-standard","hentry","category-whm"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.1.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>4 Real-time Blackhole Lists for Stronger Email Security in WHM<\/title>\n<meta name=\"description\" content=\"There are many ways to filter spam in WHM. Learn how to use Real-time Blackhole Lists (RBLs) to mitigate Business Email Compromise attacks.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.inmotionhosting.com\/support\/edu\/whm\/rbl-whm\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"4 Real-time Blackhole Lists for Stronger Email Security in WHM\" \/>\n<meta property=\"og:description\" content=\"There are many ways to filter spam in WHM. 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