{"id":643,"date":"2012-09-04T05:39:20","date_gmt":"2012-09-04T05:39:20","guid":{"rendered":"http:\/\/www.omniweb.com\/wordpress\/?p=643"},"modified":"2012-09-04T05:42:46","modified_gmt":"2012-09-04T05:42:46","slug":"solved-421-refused-the-domain-of-your-sender-address-has-no-mail-exchanger-mx","status":"publish","type":"post","link":"https:\/\/www.omniweb.com\/wordpress\/?p=643","title":{"rendered":"SOLVED 421 Refused. The domain of your sender address has no mail exchanger (MX)."},"content":{"rendered":"<p>This is error is generated by receiving servers using the <a href=\"http:\/\/www.spamdyke.org\">spamdyke<\/a> filtering program<br \/>\nSeeing the subject error in the maillog on some new CentOS 5 systems that were trying to send administrative emails.  To fix it I had to change the hostname from the firstname to the FQDN.<br \/>\nIn other words, on CentOS 5 edit \/etc\/sysconfig\/network and put in &#8216;HOSTNAME=hostname.mydomain.com&#8217; rather than just &#8216;HOSTNAME=hostname&#8217;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>This is error is generated by receiving servers using the spamdyke filtering program Seeing the subject error in the maillog on some new CentOS 5 systems that were trying to send administrative emails. To fix it I had to change &hellip; <a href=\"https:\/\/www.omniweb.com\/wordpress\/?p=643\">Continue reading <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[1],"tags":[],"_links":{"self":[{"href":"https:\/\/www.omniweb.com\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/643"}],"collection":[{"href":"https:\/\/www.omniweb.com\/wordpress\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.omniweb.com\/wordpress\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.omniweb.com\/wordpress\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.omniweb.com\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=643"}],"version-history":[{"count":5,"href":"https:\/\/www.omniweb.com\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/643\/revisions"}],"predecessor-version":[{"id":681,"href":"https:\/\/www.omniweb.com\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/643\/revisions\/681"}],"wp:attachment":[{"href":"https:\/\/www.omniweb.com\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=643"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.omniweb.com\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=643"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.omniweb.com\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=643"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}