{"id":1398,"date":"2014-09-23T22:47:54","date_gmt":"2014-09-24T03:47:54","guid":{"rendered":"http:\/\/swildow.darktech.org\/wp\/?p=1398"},"modified":"2014-09-23T22:47:54","modified_gmt":"2014-09-24T03:47:54","slug":"exchange-says-550-5-7-1-authentication-required-and-rejects-mail","status":"publish","type":"post","link":"http:\/\/www.wildow.com\/blog\/?p=1398","title":{"rendered":"Exchange says 550 5.7.1 authentication required and rejects mail"},"content":{"rendered":"<table width=\"680\">\n<tbody>\n<tr>\n<td><strong><a href=\"http:\/\/www.claudiokuenzler.com\/blog\/85\/exchange_2007_distribution_email_rejected_authentication_required\">Exchange says 550 5.7.1 authentication required and rejects mail<\/a><\/strong><\/td>\n<\/tr>\n<tr>\n<td><em>Friday &#8211; Jun 25th 2010 &#8211; by\u00a0<a href=\"http:\/\/www.claudiokuenzler.com\/about.php\">Claudio Kuenzler<\/a>\u00a0&#8211;\u00a0<a href=\"http:\/\/www.claudiokuenzler.com\/blog\/85\/exchange_2007_distribution_email_rejected_authentication_required\">(0 comments)<\/a><\/em><\/td>\n<\/tr>\n<tr>\n<td>Since Exchange 2007 there is a new behaviour in Microsoft&#8217;s Exchange Server for distribution groups. If an e-mail comes from an external server (e.g. from internet) the e-mail might be rejected and the sender might never receive an error message. This results in confusion on both sides: Where the hell did the mail go?!<br \/>\nThe resolution is simple. The Exchange logs (Message Tracking) show the following error message with an EventId FAIL:<\/p>\n<p>550 5.7.1 RESOLVER.RST.AuthRequired; authentication required<\/p>\n<p>By default, distribution groups are &#8220;made for internal purposes&#8221; and not for e-mails received by internet. Open the Exchange Management Console and open Recipient Configuration -&gt; Distribution Group. Right-click on your distribution group and select Properties.<br \/>\nIn the &#8216;Mail Flow Settings&#8217; tab click on &#8216;Message Delivery Restrictions&#8217; and click on Properties.<br \/>\nYou will see, that &#8216;Require that all senders are authenticated&#8217; is activated. Because emails from internet cannot be authenticated (by Active Directory obviously) they will not be accepted. As soon as you deactivate this option, e-mails from internet or other external sources will be accepted.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"excerpt":{"rendered":"<p>Exchange says 550 5.7.1 authentication required and rejects mail Friday &#8211; Jun 25th 2010 &#8211; by\u00a0Claudio Kuenzler\u00a0&#8211;\u00a0(0 comments) Since Exchange 2007 there is a new behaviour in Microsoft&#8217;s Exchange Server for distribution groups. If an e-mail comes from an external &#8230; <a class=\"more-link\" href=\"http:\/\/www.wildow.com\/blog\/?p=1398\">Read More &raquo;<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[14],"tags":[],"class_list":["post-1398","post","type-post","status-publish","format-standard","hentry","category-email-errors"],"_links":{"self":[{"href":"http:\/\/www.wildow.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/1398","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.wildow.com\/blog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.wildow.com\/blog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.wildow.com\/blog\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.wildow.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1398"}],"version-history":[{"count":1,"href":"http:\/\/www.wildow.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/1398\/revisions"}],"predecessor-version":[{"id":1399,"href":"http:\/\/www.wildow.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/1398\/revisions\/1399"}],"wp:attachment":[{"href":"http:\/\/www.wildow.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1398"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.wildow.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1398"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.wildow.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1398"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}