{"id":24037,"date":"2022-02-02T14:17:01","date_gmt":"2022-02-02T14:17:01","guid":{"rendered":"https:\/\/1-grid.com\/knowledge\/what-is-a-real-time-blacklist-rbl\/"},"modified":"2023-11-21T10:41:39","modified_gmt":"2023-11-21T10:41:39","slug":"what-is-a-real-time-blacklist-rbl","status":"publish","type":"ht_kb","link":"https:\/\/1grid.co.za\/knowledge\/what-is-a-real-time-blacklist-rbl\/","title":{"rendered":"What is a Real-Time Blacklist (RBL)?"},"content":{"rendered":"<p>This article delves into the mechanics behind RBLs, explaining how they contribute to the prevention of spam, phishing, and other cyber threats. Gain a deeper understanding of RBLs and their pivotal role in fortifying email security as we explore their nuances and impact.<\/p>\n<div class=\"kb-article-title\" style=\"box-sizing: border-box; word-break: normal; overflow-wrap: break-word; font-size: 1.6em; line-height: 18px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; margin-bottom: 22px; margin-left: 0px; color: #333333; font-family: 'Open Sans', Verdana, Tahoma, serif; text-align: start;\">\n<h2 dir=\"ltr\" style=\"box-sizing: border-box; font-family: inherit; font-weight: 400; line-height: 35px; color: inherit; margin: 0px; font-size: 1.5em;\">What is a Real-Time Blacklist (RBL)?<\/h2>\n<\/div>\n<div class=\"kb-article-content\" style=\"box-sizing: border-box; word-break: normal; overflow-wrap: break-word; font-size: 1.2em; line-height: 1.2em; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; letter-spacing: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; margin-bottom: 30px; margin-left: 0px; font-weight: 200; color: #333333; font-family: 'Open Sans', Verdana, Tahoma, serif; text-align: start;\">\n<p dir=\"ltr\" style=\"box-sizing: border-box; margin: 0px 0px 10px; font-size: 13px; line-height: 18px; word-break: normal; overflow-wrap: break-word;\">An RBL is a third-party listing of IP addresses which have been reported or detected to have recently sent spam. We do not maintain or have any control over listings\/removals with those third-party providers; we simply check against their listings. Some common lists are maintained by SpamHaus, SpamCop, CBL, and Barracuda.<br style=\"box-sizing: border-box;\" \/><br style=\"box-sizing: border-box;\" \/>As \u2018real-time\u2019 would suggest, these listings can occur shortly after a spam outbreak has been detected, and usually require that the administrators for that sending IP take action to address the spam issue (which may be due to a compromised email password; malicious mailing scripts on the server; etc.) and submit a delisting request, acknowledging that they have corrected the issue. Most RBLs process delisting requests within a few hours, some less than 30 minutes.<br style=\"box-sizing: border-box;\" \/><br style=\"box-sizing: border-box;\" \/>Checking a sender\u2019s IP address against reputable RBLs is a common spam-prevention measure on mailservers which helps to reduce a large portion of the spam that would otherwise be delivered to inboxes, as those listed IPs are confirmed sources of active spam.<br style=\"box-sizing: border-box;\" \/><br style=\"box-sizing: border-box;\" \/>RBL checks are enabled by default on all accounts on most Webhost&#8217;s servers. If a sender is receiving a bounceback message stating that their email was rejected due to their IP being listed in an RBL, please request that they provide that message to their email administrators so that they can investigate and correct that issue for them.<br style=\"box-sizing: border-box;\" \/><br style=\"box-sizing: border-box;\" \/>These checks can be disabled per receiving domain (i.e. the domain you have your email hosted with us, not the sender\u2019s domain) by the account holder\u2019s request, however this will very likely lead to an increase in spam as mail being sent to your domain will not be filtered against a list of known spamming IP addresses.<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>This article delves into the mechanics behind RBLs, explaining how they contribute to the prevention of spam, phishing, and other cyber threats. Gain a deeper understanding of RBLs and their pivotal role in fortifying email security as we explore their nuances and impact. What is a Real-Time Blacklist (RBL)? An&#8230;<\/p>\n","protected":false},"author":21,"comment_status":"closed","ping_status":"closed","template":"","format":"standard","meta":{"inline_featured_image":false,"footnotes":""},"ht-kb-category":[1173],"ht-kb-tag":[138,344,547,803,809,1016,1118],"class_list":["post-24037","ht_kb","type-ht_kb","status-publish","format-standard","hentry","ht_kb_category-email","ht_kb_tag-blacklist","ht_kb_tag-email-hosting","ht_kb_tag-is","ht_kb_tag-rbl","ht_kb_tag-real","ht_kb_tag-time","ht_kb_tag-what"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.0 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>What is a Real-Time Blacklist (RBL)? - 1-grid Knowledge Base<\/title>\n<meta name=\"description\" content=\"Learn about real-time blacklists (RBLs) and gain valuable insights: 1-grid Knowledge Base\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/1grid.co.za\/knowledge\/what-is-a-real-time-blacklist-rbl\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"What is a Real-Time Blacklist (RBL)? 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