{"id":192,"date":"2004-10-25T08:48:59","date_gmt":"2004-10-25T07:48:59","guid":{"rendered":"http:\/\/wp.devco.net\/?p=192"},"modified":"2009-10-09T17:12:16","modified_gmt":"2009-10-09T16:12:16","slug":"mta_oddities","status":"publish","type":"post","link":"https:\/\/www.devco.net\/archives\/2004\/10\/25\/mta_oddities.php","title":{"rendered":"MTA oddities"},"content":{"rendered":"<p>Over the weekend I gave the <a href=\"http:\/\/www.devco.net\/archives\/2004\/10\/20\/smtp_greylisting.php\">smtpinvite<\/a> thing that I <a href=\"http:\/\/info.webtv.net\/spam\/\">found on TechTV&#8217;s server<\/a> a try.  The idea is that the primary MX will always defer people &#8211; it exist solely for adding sending hosts to a whitelist &#8211; when the remote MTA then goes to the secondary it will let the mail through.<br \/>\nThis works fine for most MTA&#8217;s that I looked at during the few hours I had it up.  <a href=\"http:\/\/www.sendmail.org\">Sendmail<\/a> however will not contact the secondaries when it gets a defer message it will just keep trying to talk to the primary on each retry!  Surely that is wrong, I have not gone to study the RFC&#8217;s but it seems very stupid to me.  So unfortunately I had to abandon the idea.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Over the weekend I gave the smtpinvite thing that I found on TechTV&#8217;s server a try. The idea is that the primary MX will always defer people &#8211; it exist solely for adding sending hosts to a whitelist &#8211; when the remote MTA then goes to the secondary it will let the mail through. This [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","footnotes":""},"categories":[6],"tags":[30,33],"_links":{"self":[{"href":"https:\/\/www.devco.net\/wp-json\/wp\/v2\/posts\/192"}],"collection":[{"href":"https:\/\/www.devco.net\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.devco.net\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.devco.net\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.devco.net\/wp-json\/wp\/v2\/comments?post=192"}],"version-history":[{"count":1,"href":"https:\/\/www.devco.net\/wp-json\/wp\/v2\/posts\/192\/revisions"}],"predecessor-version":[{"id":739,"href":"https:\/\/www.devco.net\/wp-json\/wp\/v2\/posts\/192\/revisions\/739"}],"wp:attachment":[{"href":"https:\/\/www.devco.net\/wp-json\/wp\/v2\/media?parent=192"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.devco.net\/wp-json\/wp\/v2\/categories?post=192"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.devco.net\/wp-json\/wp\/v2\/tags?post=192"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}