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field-type-text-long service-header__summary l-gutter--right">Allow and deny lists identify sources of email abuse, or known 'good' email servers. With a Janet connection you聽can gain聽access to and benefit from a number of these聽leading聽lists.</p> </div>  <div class="col span-6"> <div class="contact-panel contact-panel--has-callout-top"> <div class="c-contact-panel__contact-details"> <p class="visuallyhidden">For enquiries contact:</p> <ul> <li class="c-contact-panel__contact-details-item"> <a class="c-contact-panel__contact-details-link" href="tel:03003002212"><span class="phone-link contact-panel__focal">0300 300 2212</span></a> </li> <li class="c-contact-panel__contact-details-item"> <a class="c-contact-panel__contact-details-link" href="http://web.archive.org/web/20220704224135/mailto:securityservices@jisc.ac.uk" itemprop="email"><i aria-hidden="true" class="fas fa-envelope c-contact-panel__contact-details-link-icon"></i> <span class="c-contact-panel__contact-details-link-text">securityservices@jisc.ac.uk</span></a> </li> </ul> </div> </div>  </div>  </div>  <div class="row break-contact-panel article-full"> <div class="article-full__body"> <div class="product-service-body col span-9"> <div class="field field-type-text-long"><h2>About allow and deny lists</h2><p>Access our copies of several leading DNS allow and deny lists in order to protect your users from email abuse.</p><p>Deny lists will enable you to block 'unwanted' email, while at the other end of the spectrum, allow lists will allow 'wanted' email to get through to end-users.</p><p>We currently subscribe to the following:</p><ul><li><strong>Deny lists</strong> - Spamhaus Zen</li><li><strong>URI list</strong> - URIBL</li><li><strong>Allow lists</strong> - Spamhaus SWL and DWL plus DNSWL.org</li></ul><p>If you think that one of our DNS deny lists is affecting the delivery of your email messages then visit our <a href="http://web.archive.org/web/20220704224135/https://community.jisc.ac.uk/library/janet-services-documentation/what-do-if-your-mail-being-blocked-0">community page on what to do if your mail is being blocked</a>.</p><h2>Get in touch</h2><p>To find out more, contact us on <a href="http://web.archive.org/web/20220704224135/mailto:service@ja.net">service@ja.net</a> or call 0300 300 2212.</p><div class="is-tabbed-desktop"> <section class="is-collapsible-mobile cx_tabs__section"> <h2 class="cx_tabs__heading cx_collapsibles__trigger">Key features</h2><div class="cx_collapsibles__target"><ul><li>Comprehensive lists </li><li>Quick look-ups from Janet mirrors</li><li>No paying for separate subscriptions</li><li>Rapid identification of unwanted email</li><li>Reduced risk of losing legitimate email</li><li>Impartial advice and tips on use from our experts</li><li>Internationally recognised, reliable databases of IP addresses</li></ul></div></section><section class="is-collapsible-mobile cx_tabs__section"> <h2 class="cx_tabs__heading cx_collapsibles__trigger">Eligibility</h2><div class="cx_collapsibles__target"><p>This service is freely available to all Janet-connected organisations. </p><p>Use of this service is subject to adherence to the:</p><ul><li><a href="http://web.archive.org/web/20220704224135/https://repository.jisc.ac.uk/7562/1/janet-network-connection-policy-november-2019.pdf">Janet Network connection policy (pdf)</a></li><li><a href="http://web.archive.org/web/20220704224135/https://community.jisc.ac.uk/library/acceptable-use-policy">Janet acceptable use policy</a></li><li><a href="http://web.archive.org/web/20220704224135/https://community.jisc.ac.uk/library/janet-policies/security-policy">Janet security policy</a></li></ul><p>Access to the lists are controlled through your organisation's IP address. Our <a href="http://web.archive.org/web/20220704224135/https://community.jisc.ac.uk/library/janet-services-documentation/dns-allow-and-deny-lists">allow and deny lists community page</a> has more detailed information about how the service works.</p></div></section><section class="is-collapsible-mobile cx_tabs__section"> <h2 class="cx_tabs__heading cx_collapsibles__trigger">Technical information</h2><div class="cx_collapsibles__target"><p>This service supports both IPv4 and IPv6.</p><p>This service takes feeds from the following reputable lists:</p><ol><li>Three Spamhaus lists (SBL, XBL and PBL) plus these lists joined together as a Zen list</li><li>The Spamhaus allow list</li><li>The multi.uribl.com URIBL list</li><li>The dnswl.org allow list</li></ol></div></section><section class="is-collapsible-mobile cx_tabs__section"> <h2 class="cx_tabs__heading cx_collapsibles__trigger"><span class="lexicon-term has-tooltip" title="domain name system"><abbr title="domain name system">DNS</abbr></span> list profiles</h2><div class="cx_collapsibles__target"><h3>Recommendations</h3><p>We recommend that you use the Spamhaus sender lists in the first phase. In the second stage filter, the URIBL list can help to locate many of the otherwise difficult, remaining unwanted messages.</p><h3>Deny lists</h3><p><span class="lexicon-term has-tooltip" title="domain name system"><abbr title="domain name system">DNS</abbr></span> deny lists are a well-established technique that identify sources of email abuse as lists of IP address blocks, enabling Janet-connected organisations to quickly and easily reject a high proportion of unwanted email.</p><h3>URI lists</h3><p>Unlike most deny lists, URIBLs are not lists of message senders but URLs (web addresses, some but not all representing undesirable sites) which have been seen in email messages and have been identified as spam or phishing, or are otherwise malicious.</p><p>Links seen in these messages are more stable than the rapidly changing botnet IP addresses used to send the vast majority of them.</p><h3>Allow lists</h3><p>Allow lists contain all currently known trusted email servers, and are the opposite of deny lists. Email from listed email addresses, domains and/or IP address should generally be allowed through the mail server.</p><p>Email allow lists are used to reduce the incidence of false positives and to speed up the filtering process, as they are often based on the assumption that most legitimate mail will be from a relatively small and fixed set of senders.</p></div></section></div><section class="is-collapsible is-collapsible--blue user-created "><h3 class="cx_collapsibles__trigger"><a id="sld" name="sld"></a>Service level description</h3><div class="cx_collapsibles__target"><h3>Service description</h3><p>This is an email abuse protection service to assist electronic mail systems at organisations to determine if they should refuse connections from certain addresses. The system is based on data from reputable sources and provides <span class="lexicon-term has-tooltip" title="domain name system"><abbr title="domain name system">DNS</abbr></span>-style resolution.</p><h3>Charges</h3><p>This service is centrally-funded.</p><h3>Your responsibilities</h3><p>You are responsible for ensuring that the email system at the organisation is configured to use the service.</p><p>You are also responsible on an ongoing basis for maintaining contact details.</p><h3>Security</h3><p>Please ensure your organisation understands and adheres to the <a href="http://web.archive.org/web/20220704224135/https://community.jisc.ac.uk/library/janet-policies/security-policy" target="_blank" title="Janet Security Policy">security policy</a>.</p><h3>Hours of service</h3><p>The service is available 24 hours a day, seven days a week, all year.</p><h3>Target availability</h3><p>The target availability is 99.5% during the hours of service defined above, measured monthly over a 12 month period, excluding service-affecting maintenance.</p><p>Service-affecting maintenance is capped at 0.5% and is normally carried out with at least two weeks' notice.</p><h3>Fault management</h3><p>Faults with the service may be reported via the service desk on tel: 0300 300 2212 or via email: <a href="http://web.archive.org/web/20220704224135/mailto:help@jisc.ac.uk">help@jisc.ac.uk</a>.</p><p>For full details please visit the <a href="http://web.archive.org/web/20220704224135/https://www.jisc.ac.uk/janet/fault-reporting">fault reporting</a> page.</p><h3>Resilience</h3><p>The service comprises multiple servers that automatically take over from one another if a server fails - giving you peace of mind.</p><h3>Request for service</h3><p>You can request this service via the service desk on tel 0300 300 2212 or via email: <a href="http://web.archive.org/web/20220704224135/mailto:help@jisc.ac.uk">help@jisc.ac.uk</a></p><h3>Service delivery time</h3><p>The service will be delivered within five business days of receipt of all necessary information.</p><h3>Terms and conditions</h3><p>Please ensure your organisation understands and adheres to the <a href="http://web.archive.org/web/20220704224135/https://community.jisc.ac.uk/library/janet-policies/terms-provision-janet-service">terms and conditions</a></p><h3>Escalation</h3><p>If you are experiencing an issue with the service, and wish to escalate the issue within Janet please contact us via the service desk on tel: 0300 300 2212 or via email: <a href="http://web.archive.org/web/20220704224135/mailto:help@jisc.ac.uk">help@jisc.ac.uk</a>. </p><h3>Technical section</h3><p>This service supports both IPv4 and IPv6.</p><p>This service takes feeds from the following reputable lists:</p><ol><li>Three Spamhaus lists (SBL, XBL and PBL) plus these lists joined together as a Zen list</li><li>The Spamhaus allow list</li><li>The multi.uribl.com URIBL list</li><li>The dnswl.org allow list</li></ol><p>For details of how to use this service and for more information on the details of the maintained lists, visit the <a href="http://web.archive.org/web/20220704224135/https://community.jisc.ac.uk/library/janet-services-documentation/dns-allow-and-deny-lists">allow and deny lists community page</a>.</p></div></section><p> <figure class="media media-element media--left file-default"> <div class="media__inner"> <img alt="ISO9001 with UK National Accreditation" data-delta="2" typeof="foaf:Image" src="http://web.archive.org/web/20220704224135im_/https://www.jisc.ac.uk/sites/default/files/iso_9001ukas.jpg" title=""/> </div> </figure> </p><p>This service is included within the scope of our ISO9001 certificate.</p><p><a href="http://web.archive.org/web/20220704224135/https://www.jisc.ac.uk/network/iso-certification">Read more about International Organisation for Standardisation (ISO) standards and view Jisc certificates.</a></p> </div> </div> </div> </div> </header>  </div>  </div>  </div>  <div class="inner l-pull-left"> <div 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