{"id":378,"date":"2006-10-06T14:01:00","date_gmt":"2006-10-06T14:01:00","guid":{"rendered":"http:\/\/markwilson.me.uk\/blog\/2006\/10\/implementing-real-time-block-lists-for.htm"},"modified":"2007-05-21T19:48:51","modified_gmt":"2007-05-21T18:48:51","slug":"implementing-real-time-block-lists-for","status":"publish","type":"post","link":"https:\/\/www.markwilson.co.uk\/blog\/2006\/10\/implementing-real-time-block-lists-for.htm","title":{"rendered":"Implementing real time block lists for spam control"},"content":{"rendered":"<p><!--116032113493824471--><a href=\"http:\/\/www.spamhaus.org\/\"><img data-recalc-dims=\"1\" decoding=\"async\" src=\"https:\/\/i0.wp.com\/www.markwilson.co.uk\/blog\/images\/spamhaus.jpg?w=700&#038;ssl=1\" alt=\"The Spamhaus Project\" class=\"inline\" \/><\/a><br \/>\nA couple of months back, I wrote a post about <a href=\"https:\/\/www.markwilson.co.uk\/blog\/2006\/08\/controlling-spam-using-microsoft.htm\">controlling spam using the Microsoft Exchange Intelligent Message Filter<\/a>. Whilst it has to be said that the IMF has been effective in reducing my spam volumes (with very low false positives &#8211; strangely enough my blog posts are the ones it has most trouble with) it&#8217;s still not catching all of the unsolicited commercial e-mail (UCE) that I receive, so this week I resorted to another spam control &#8211; real time DNS block lists.<\/p>\n<p>Various lists exist with details of known spam relays and the one I&#8217;m using is from <a href=\"http:\/\/www.spamhaus.org\/\">the Spamhaus project<\/a>. Actually I&#8217;m using two of their lists &#8211; the Spamhaus block list (SBL) and the Spamhaus exploits block list (XBL), both of which are free for non-commercial use &#8211; I may add other services later.<\/p>\n<p>Setting up the block lists within Microsoft Exchange Server was reasonably straightforward, following <a href=\"http:\/\/www.petri.co.il\/block_spam_with_exchange_2003.htm\">advice from Daniel Petri<\/a> (further information can be found in <a href=\"http:\/\/support.microsoft.com\/?kbid=823866\">Microsoft knowledge base article 823866<\/a>). I then tested the service as recommended at <a href=\"http:\/\/www.crynwr.com\/spam\/\">Crynwr Software&#8217;s spam blocking resources page<\/a>. After initial problems testing the service as my mail was being routed via my ISP&#8217;s relays (but I could see the conversation when I telnetted to Crynwr&#8217;s servers) I switched to DNS-based routing and received a satisfactory response to the e-mail tests &#8211; most importantly showing the following text in the SMTP conversation:<\/p>\n<p><span style=\"font-style: italic\">550 5.7.1 <\/span>knownspamserveripaddress<span style=\"font-style: italic\"> has been blocked by Spamhaus<\/span><span style=\"font-style: italic\"><br \/>\n<\/span><span style=\"font-style: italic\">Terminating conversation<\/span><\/p>\n<p>So, that&#8217;s another tool in my anti-spam arsenal. The UCE levels appear to be tailing off now&#8230; hopefully I&#8217;m not dropping too much &#8220;real e-mail&#8221;. One day I hope to be able to say (in the style of <a href=\"http:\/\/www.dvorak.org\/\">John C Dvorak<\/a>) &#8220;I get no spam&#8221;.<\/p>\n<p><img data-recalc-dims=\"1\" decoding=\"async\" src=\"https:\/\/i0.wp.com\/www.markwilson.co.uk\/blog\/images\/sbl.gif?w=700&#038;ssl=1\" alt=\"E-mail protected by SBL advisory\" class=\"inline\" \/> <img data-recalc-dims=\"1\" decoding=\"async\" src=\"https:\/\/i0.wp.com\/www.markwilson.co.uk\/blog\/images\/xbl.gif?w=700&#038;ssl=1\" alt=\"E-mail protected by SBL advisory\" class=\"inline\" \/><\/p>\n","protected":false},"excerpt":{"rendered":"<p>A couple of months back, I wrote a post about controlling spam using the Microsoft Exchange Intelligent Message Filter. Whilst it has to be said that the IMF has been effective in reducing my spam volumes (with very low false positives &#8211; strangely enough my blog posts are the ones it has most trouble with) &hellip; <a href=\"https:\/\/www.markwilson.co.uk\/blog\/2006\/10\/implementing-real-time-block-lists-for.htm\" class=\"more-link\">Continue reading <span class=\"screen-reader-text\">Implementing real time block lists for spam control<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_exactmetrics_skip_tracking":false,"_exactmetrics_sitenote_active":false,"_exactmetrics_sitenote_note":"","_exactmetrics_sitenote_category":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[],"tags":[46,10],"class_list":["post-378","post","type-post","status-publish","format-standard","hentry","tag-exchange","tag-spam"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Implementing real time block lists for spam control - markwilson.it<\/title>\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.markwilson.co.uk\/blog\/2006\/10\/implementing-real-time-block-lists-for.htm\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Implementing real time block lists for spam control - markwilson.it\" \/>\n<meta property=\"og:description\" content=\"A couple of months back, I wrote a post about controlling spam using the Microsoft Exchange Intelligent Message Filter. Whilst it has to be said that the IMF has been effective in reducing my spam volumes (with very low false positives &#8211; strangely enough my blog posts are the ones it has most trouble with) &hellip; Continue reading Implementing real time block lists for spam control\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.markwilson.co.uk\/blog\/2006\/10\/implementing-real-time-block-lists-for.htm\" \/>\n<meta property=\"og:site_name\" content=\"markwilson.it\" \/>\n<meta property=\"article:published_time\" content=\"2006-10-06T14:01:00+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2007-05-21T18:48:51+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.markwilson.co.uk\/blog\/images\/spamhaus.jpg\" \/>\n<meta name=\"author\" content=\"Mark Wilson\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@markwilsonit\" \/>\n<meta name=\"twitter:site\" content=\"@markwilsonit\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Mark Wilson\" \/>\n\t<meta name=\"twitter:label2\" content=\"Estimated reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/2006\\\/10\\\/implementing-real-time-block-lists-for.htm#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/2006\\\/10\\\/implementing-real-time-block-lists-for.htm\"},\"author\":{\"name\":\"Mark Wilson\",\"@id\":\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/#\\\/schema\\\/person\\\/98f61365e7c39d6be942174b8c4de468\"},\"headline\":\"Implementing real time block lists for spam control\",\"datePublished\":\"2006-10-06T14:01:00+00:00\",\"dateModified\":\"2007-05-21T18:48:51+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/2006\\\/10\\\/implementing-real-time-block-lists-for.htm\"},\"wordCount\":301,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/#\\\/schema\\\/person\\\/98f61365e7c39d6be942174b8c4de468\"},\"image\":{\"@id\":\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/2006\\\/10\\\/implementing-real-time-block-lists-for.htm#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/images\\\/spamhaus.jpg\",\"keywords\":[\"Microsoft Exchange\",\"Spam\"],\"inLanguage\":\"en-GB\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/2006\\\/10\\\/implementing-real-time-block-lists-for.htm#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/2006\\\/10\\\/implementing-real-time-block-lists-for.htm\",\"url\":\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/2006\\\/10\\\/implementing-real-time-block-lists-for.htm\",\"name\":\"Implementing real time block lists for spam control - markwilson.it\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/2006\\\/10\\\/implementing-real-time-block-lists-for.htm#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/2006\\\/10\\\/implementing-real-time-block-lists-for.htm#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/images\\\/spamhaus.jpg\",\"datePublished\":\"2006-10-06T14:01:00+00:00\",\"dateModified\":\"2007-05-21T18:48:51+00:00\",\"breadcrumb\":{\"@id\":\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/2006\\\/10\\\/implementing-real-time-block-lists-for.htm#breadcrumb\"},\"inLanguage\":\"en-GB\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/2006\\\/10\\\/implementing-real-time-block-lists-for.htm\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"en-GB\",\"@id\":\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/2006\\\/10\\\/implementing-real-time-block-lists-for.htm#primaryimage\",\"url\":\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/images\\\/spamhaus.jpg\",\"contentUrl\":\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/images\\\/spamhaus.jpg\"},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/2006\\\/10\\\/implementing-real-time-block-lists-for.htm#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Implementing real time block lists for spam control\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/#website\",\"url\":\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/\",\"name\":\"markwilson.it\",\"description\":\"get-info -class technology | write-output &gt; 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At the time\u2026","rel":"","context":"In \"Microsoft Exchange\"","block_context":{"text":"Microsoft Exchange","link":"https:\/\/www.markwilson.co.uk\/blog\/tag\/exchange"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":70,"url":"https:\/\/www.markwilson.co.uk\/blog\/2005\/03\/new-face-of-spam.htm","url_meta":{"origin":378,"position":1},"title":"The new face of spam","author":"Mark Wilson","date":"Friday 18 March 2005","format":false,"excerpt":"We are all used to spam arriving in our e-mail inboxes, but now the problem is spreading to other communications methods. Research by Wireless Services Corporation shows almost half of the mobile phone text messages received in the US are spam, compared with 18% a year ago. Another problem is\u2026","rel":"","context":"In \"E-mail\"","block_context":{"text":"E-mail","link":"https:\/\/www.markwilson.co.uk\/blog\/tag\/e-mail"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":619,"url":"https:\/\/www.markwilson.co.uk\/blog\/2006\/08\/avoiding-compulsory-website.htm","url_meta":{"origin":378,"position":2},"title":"Avoiding compulsory website registration","author":"Mark Wilson","date":"Thursday 24 August 2006","format":false,"excerpt":"I'm sick of giving out my personal details (even false ones) to websites that require me to register. A few months back I wrote about using a temporary e-mail address to avoid spammers but now (thanks to a comment on a post at 4sysops), I've discovered BugMeNot a site that\u2026","rel":"","context":"In \"Spam\"","block_context":{"text":"Spam","link":"https:\/\/www.markwilson.co.uk\/blog\/tag\/spam"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":624,"url":"https:\/\/www.markwilson.co.uk\/blog\/2006\/10\/message-hygiene-principles-for.htm","url_meta":{"origin":378,"position":3},"title":"Message hygiene principles for Microsoft Exchange Server","author":"Mark Wilson","date":"Tuesday 3 October 2006","format":false,"excerpt":"Whilst researching my post on the Microsoft Exchange intelligent message filter a couple of months back, I came across the following message hygiene architectural principles, which Microsoft promotes as best practice: Anti-spam filtering must be performed before anti-virus filtering. Anti-spam filtering should be performed for inbound mail only. Anti-spam filtering\u2026","rel":"","context":"In \"Malware\"","block_context":{"text":"Malware","link":"https:\/\/www.markwilson.co.uk\/blog\/tag\/malware"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":10,"url":"https:\/\/www.markwilson.co.uk\/blog\/2004\/08\/tackling-spam-in-exchange-with-regex.htm","url_meta":{"origin":378,"position":4},"title":"Tackling spam in Exchange with the RegEx SURBL","author":"Mark Wilson","date":"Monday 23 August 2004","format":false,"excerpt":"Last week, I read an interesting e-mail from the Windows and .NET magazine network Exchange and Outlook update, discussing Spam URL Realtime Block Lists (SURBLs), which examine message contents to block spam. This week's e-mail highlights a free Exchange Server SURBL - the RegEx filter. The basic idea behind the\u2026","rel":"","context":"In \"Microsoft Exchange\"","block_context":{"text":"Microsoft Exchange","link":"https:\/\/www.markwilson.co.uk\/blog\/tag\/exchange"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":6211,"url":"https:\/\/www.markwilson.co.uk\/blog\/2015\/11\/clutter-and-junk-email-in-exchange-online.htm","url_meta":{"origin":378,"position":5},"title":"Clutter and Junk Email in Exchange Online","author":"Mark Wilson","date":"Monday 16 November 2015","format":false,"excerpt":"One of my\u00a0Office 365 customers has been asking about Clutter and Junk Email -\u00a0with concerns that Clutter doesn't move all the mail they think it should and also that more email is being trapped as junk than they expect (or experienced\u00a0with on-premises Exchange. \u00a0I thought it might be useful to\u2026","rel":"","context":"In &quot;Technology&quot;","block_context":{"text":"Technology","link":"https:\/\/www.markwilson.co.uk\/blog\/topic\/technology"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]}],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.markwilson.co.uk\/blog\/wp-json\/wp\/v2\/posts\/378","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.markwilson.co.uk\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.markwilson.co.uk\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.markwilson.co.uk\/blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.markwilson.co.uk\/blog\/wp-json\/wp\/v2\/comments?post=378"}],"version-history":[{"count":0,"href":"https:\/\/www.markwilson.co.uk\/blog\/wp-json\/wp\/v2\/posts\/378\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.markwilson.co.uk\/blog\/wp-json\/wp\/v2\/media?parent=378"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.markwilson.co.uk\/blog\/wp-json\/wp\/v2\/categories?post=378"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.markwilson.co.uk\/blog\/wp-json\/wp\/v2\/tags?post=378"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}