{"id":10,"date":"2004-08-23T09:17:00","date_gmt":"2004-08-23T09:17:00","guid":{"rendered":"http:\/\/markwilson.me.uk\/blog\/2004\/08\/tackling-spam-in-exchange-with-regex.htm"},"modified":"2007-05-23T17:10:43","modified_gmt":"2007-05-23T16:10:43","slug":"tackling-spam-in-exchange-with-regex","status":"publish","type":"post","link":"https:\/\/www.markwilson.co.uk\/blog\/2004\/08\/tackling-spam-in-exchange-with-regex.htm","title":{"rendered":"Tackling spam in Exchange with the RegEx SURBL"},"content":{"rendered":"<p><!--109325426014202215-->Last week, I read an interesting e-mail from the <a href=\"http:\/\/www.winntmag.com\/\">Windows and .NET magazine network<\/a> Exchange and Outlook update, discussing Spam URL Realtime Block Lists (SURBLs), which examine message contents to block spam. This week&#8217;s e-mail highlights <a href=\"http:\/\/www.2150.com\/regexfilter\/\">a free Exchange Server SURBL &#8211; the RegEx filter<\/a><a href=\"http:\/\/www.2150.com\/regexfilter\/\"><\/a>.<\/p>\n<p>The basic idea behind the RegEx Filter, is the ability to filter email based on any arbitrary text pattern. It is implemented as an event sink that hooks into the Exchange SMTP engine (by default, the filter works only with the first virtual server instance, but this can easily be changed) and applies regular expression tests against the message sender, recipient, or contents.<\/p>\n<p>It is possible to specify any number of individual filters to run against incoming messages and the filter also includes:<\/p>\n<ul>\n<li>A large filter file that tests for common patterns found in adult-oriented spam.<\/li>\n<li>A whitelist of expressions to be allowed; by customizing this list, it is possible to easily whitelist addresses or senders.<\/li>\n<li>A list of blocked recipients; the filter drops blocked recipients as soon as it sees the SMTP <code>rcpt to<\/code> verb, instead of waiting until the mail has been accepted for delivery.<\/li>\n<li>A list with expressions commonly found in &#8220;Nigerian scam&#8221; messages.<\/li>\n<\/ul>\n<p>Any or all of these capabilities can be used to roll in additional filtered expressions (by editing XML files, as long as there is a regular expression that will match the messages to be accepted or dropped). The XML schema for the filtering language includes the ability to specify IP address ranges, perform DNS lookups and filter according to the results, slow down the sending mail server by imposing a timeout (for punishing repetitive spammers), and a host of other features.<\/p>\n<p>I haven&#8217;t tested the filter yet (I need to move my e-mail service over to Exchange first), but in Paul Robichaux&#8217;s original article (from which the information in this post is taken) he suggested that the filter didn&#8217;t add any significant performance overhead and that it also includes a set of Performance Monitor counters that can be registered to assist in assessing any performance issues as a result of filtering.<\/p>\n<p>Robichaux also highlighted that RegEx isn&#8217;t perfect: its documentation is pretty opaque, and there&#8217;s no real step-by-step guide to installing the filter on an Exchange server. Also (and potentially worrying) the default filter configuration logs all accepted messages to disk, exposing all valid, accepted mail in plain text form. Apart from the obvious security implications, these logs also consume a large amount of disk space. Fortunately, the logging can be turned off.<\/p>\n<p>This looks to me, to be a useful (free) tool in the battle to prevent spam.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>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&#8217;s e-mail highlights a free Exchange Server SURBL &#8211; the RegEx filter. The basic idea behind the RegEx Filter, is the ability &hellip; <a href=\"https:\/\/www.markwilson.co.uk\/blog\/2004\/08\/tackling-spam-in-exchange-with-regex.htm\" class=\"more-link\">Continue reading <span class=\"screen-reader-text\">Tackling spam in Exchange with the RegEx SURBL<\/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-10","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>Tackling spam in Exchange with the RegEx SURBL - 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\/2004\/08\/tackling-spam-in-exchange-with-regex.htm\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Tackling spam in Exchange with the RegEx SURBL - markwilson.it\" \/>\n<meta property=\"og:description\" content=\"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. 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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":629,"url":"https:\/\/www.markwilson.co.uk\/blog\/2006\/08\/controlling-spam-using-microsoft.htm","url_meta":{"origin":10,"position":1},"title":"Controlling spam using the Microsoft Exchange intelligent message filter","author":"Mark Wilson","date":"Wednesday 2 August 2006","format":false,"excerpt":"It may just be a co-incidence, but since I switched my e-mail from my ISP's servers to my own server a few months back, I've been seeing a huge increase in the amount of unsolicited commercial e-mail (UCE) - commonly known as spam - in my mailbox. 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":10,"position":2},"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":378,"url":"https:\/\/www.markwilson.co.uk\/blog\/2006\/10\/implementing-real-time-block-lists-for.htm","url_meta":{"origin":10,"position":3},"title":"Implementing real time block lists for spam control","author":"Mark Wilson","date":"Friday 6 October 2006","format":false,"excerpt":"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 - strangely enough my blog posts are the ones\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":2746,"url":"https:\/\/www.markwilson.co.uk\/blog\/2011\/06\/office-365-message-filtering-and-a-horrible-little-bug-that-leaves-email-addresses-exposed.htm","url_meta":{"origin":10,"position":4},"title":"Office 365 message filtering (and a horrible little bug that leaves email addresses exposed&#8230;)","author":"Mark Wilson","date":"Wednesday 1 June 2011","format":false,"excerpt":"One of my concerns with my recent switch from Google Apps Mail to Microsoft Office 365 was about spam email. You see, I get none. \u00a0Well, when I say I get none, I get plenty but it's all trapped for me. 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Only a handful\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":[]},{"id":6211,"url":"https:\/\/www.markwilson.co.uk\/blog\/2015\/11\/clutter-and-junk-email-in-exchange-online.htm","url_meta":{"origin":10,"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\/10","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=10"}],"version-history":[{"count":0,"href":"https:\/\/www.markwilson.co.uk\/blog\/wp-json\/wp\/v2\/posts\/10\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.markwilson.co.uk\/blog\/wp-json\/wp\/v2\/media?parent=10"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.markwilson.co.uk\/blog\/wp-json\/wp\/v2\/categories?post=10"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.markwilson.co.uk\/blog\/wp-json\/wp\/v2\/tags?post=10"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}