{"id":1604,"date":"2019-08-06T17:28:23","date_gmt":"2019-08-06T09:28:23","guid":{"rendered":"https:\/\/www.computersolutions.cn\/blog\/?p=1604"},"modified":"2019-08-06T17:30:16","modified_gmt":"2019-08-06T09:30:16","slug":"mail-server-updates","status":"publish","type":"post","link":"https:\/\/www.computersolutions.cn\/blog\/2019\/08\/mail-server-updates\/","title":{"rendered":"Mail Server Updates"},"content":{"rendered":"\n<p>The mail software has been completely revamped to support additional security precautions. <\/p>\n\n\n\n<p>Failed logins will be blocked by ip address for 1 hour. (5 fails to trigger a 1hr block)<\/p>\n\n\n\n<p>Senders can only send mail from their authenticated email address.<\/p>\n\n\n\n<p>Outgoing mail is now also inspected for spam, if tests fail, sending will fail.<\/p>\n\n\n\n<p>DKIM signing is now possible, we are in the process of implementation and testing.<\/p>\n\n\n\n<p>SSL connections are now set to a minimum of TLS1.2 and 2048bit encryption, as per internet standards.<\/p>\n\n\n\n<p>Support for connecting to servers still using old insecure protocols has been deprecated (i.e. not supported anymore).<br>The protocol insecurity issue is explained in more detail here &#8211;<br><a class=\"\" href=\"https:\/\/weakdh.org\/\">https:\/\/weakdh.org<\/a><\/p>\n\n\n\n<p>This has impacted some deliveries to outdated servers, which still use outdated software.  <\/p>\n\n\n\n<p><strong>We can resolve these issues on a case by case basis if you forward support the relevant bounce messages.<\/strong><\/p>\n\n\n\n<p>If you see bounce messages with errors similar to this &#8211; <br>SSL routines:tls_process_ske_dhe:dh key too small;<br>SSL routines:ssl_choose_client_version:unsupported protocol;<\/p>\n\n\n\n<p>The recipients server&#8217;s SSL key setup (the key they use for encryption for <em>their<\/em> mail server) is an issue.<br>Their keys are too small, and vulnerable to eavesdropping, and ideally need to be updated, as their communications are vulnerable.<\/p>\n\n\n\n<p>\u00a0<br><br><\/p>\n\n\n\n<p><\/p>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>The mail software has been completely revamped to support additional security precautions. Failed logins will be blocked by ip address for 1 hour. (5 fails to trigger a 1hr block) Senders can only send mail from their authenticated email address. Outgoing mail is now also inspected for spam, if tests fail, sending will fail. DKIM [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1],"tags":[],"class_list":["post-1604","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.computersolutions.cn\/blog\/wp-json\/wp\/v2\/posts\/1604","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.computersolutions.cn\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.computersolutions.cn\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.computersolutions.cn\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.computersolutions.cn\/blog\/wp-json\/wp\/v2\/comments?post=1604"}],"version-history":[{"count":2,"href":"https:\/\/www.computersolutions.cn\/blog\/wp-json\/wp\/v2\/posts\/1604\/revisions"}],"predecessor-version":[{"id":1606,"href":"https:\/\/www.computersolutions.cn\/blog\/wp-json\/wp\/v2\/posts\/1604\/revisions\/1606"}],"wp:attachment":[{"href":"https:\/\/www.computersolutions.cn\/blog\/wp-json\/wp\/v2\/media?parent=1604"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.computersolutions.cn\/blog\/wp-json\/wp\/v2\/categories?post=1604"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.computersolutions.cn\/blog\/wp-json\/wp\/v2\/tags?post=1604"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}