{"id":9112,"date":"2007-12-05T17:01:00","date_gmt":"2007-12-05T22:01:00","guid":{"rendered":"https:\/\/nuxx.net\/blog\/2007\/12\/05\/helo\/"},"modified":"2026-07-01T11:36:19","modified_gmt":"2026-07-01T15:36:19","slug":"helo","status":"publish","type":"post","link":"https:\/\/nuxx.net\/blog\/2007\/12\/05\/helo\/","title":{"rendered":"HELO"},"content":{"rendered":"<p>After not receiving the shipping notification for something I received last night, I have decided to try disabling Postfix&#8217;s HELO validations on my server. This will likely lead to far more spam being delivered, but it should eliminate odd rejections from non-compliant servers.<\/p>\n<p>I had <tt>smtpd_helo_restrictions = reject_invalid_hostname, reject_non_fqdn_hostname<\/tt> set, which can be referenced <a href=\"http:\/\/www.postfix.org\/uce.html#smtpd_helo_restrictions\">here<\/a>. The problem was some sites wouldn&#8217;t send a proper HELO, leading to mail not being delivered as it should have been. Maybe it&#8217;d be best to have a SA rule which marks down improper HELOs instead of simply blocking them.<\/p>\n<p>If spam levels get too high again, maybe I&#8217;ll go back to the old restrictions. They generally work fine.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>After not receiving the shipping notification for something I received last night, I have decided to try disabling Postfix&#8217;s HELO validations on my server. This will likely lead to far more spam being delivered, but it should eliminate odd rejections from non-compliant servers. I had smtpd_helo_restrictions = reject_invalid_hostname, reject_non_fqdn_hostname set, which can be referenced here.\u2026<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[13,34],"tags":[],"class_list":["post-9112","post","type-post","status-publish","format-standard","hentry","category-computers","category-moved-from-livejournal"],"_links":{"self":[{"href":"https:\/\/nuxx.net\/blog\/wp-json\/wp\/v2\/posts\/9112","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/nuxx.net\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/nuxx.net\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/nuxx.net\/blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/nuxx.net\/blog\/wp-json\/wp\/v2\/comments?post=9112"}],"version-history":[{"count":3,"href":"https:\/\/nuxx.net\/blog\/wp-json\/wp\/v2\/posts\/9112\/revisions"}],"predecessor-version":[{"id":12517,"href":"https:\/\/nuxx.net\/blog\/wp-json\/wp\/v2\/posts\/9112\/revisions\/12517"}],"wp:attachment":[{"href":"https:\/\/nuxx.net\/blog\/wp-json\/wp\/v2\/media?parent=9112"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/nuxx.net\/blog\/wp-json\/wp\/v2\/categories?post=9112"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/nuxx.net\/blog\/wp-json\/wp\/v2\/tags?post=9112"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}