{"id":5284,"date":"2021-09-09T11:57:15","date_gmt":"2021-09-09T11:57:15","guid":{"rendered":"https:\/\/pariswells.com\/blog\/?p=5284"},"modified":"2021-09-09T11:57:15","modified_gmt":"2021-09-09T11:57:15","slug":"resent-from-header-rewrite-envelope-365","status":"publish","type":"post","link":"https:\/\/pariswells.com\/blog\/research\/resent-from-header-rewrite-envelope-365","title":{"rendered":"Resent-from Header \\ ReWrite \\ Envelope &#8211; 365"},"content":{"rendered":"<p style=\"text-align: center;\">Sender -&gt; Forward Server -&gt; Reciepient<\/p><p>Exchange 2010 uses a <strong>Resent-From<\/strong> header that is added to the message while it is being forwarded externally by the forward server ( this address is the email account used to forward the email )\u00a0 so emails to the Reciepient server, are checked for SPF check using the Resent-From address and IPs. Which Pass!<\/p><p>With 2016 or Office 365 this Resent-From header is not there and the external contact server does the SPF check using the original sender&#8217;s domain and forward server IP address and it hard fails spf.<\/p><p>Workaround: Message Header ReWrite<\/p><p>Use Mimecast to Rewrite the Envelop from Address to the <strong>Resent-From\u00a0<\/strong>Address instead<\/p><p><a href=\"https:\/\/community.mimecast.com\/s\/article\/Configuring-Address-Alteration-Definitions-and-Policies\">Configuring Address Alteration Definitions and Policies (mimecast.com)<\/a><\/p><p>&nbsp;<\/p><p>SRS Should be doing this as well<\/p><p><a href=\"https:\/\/docs.microsoft.com\/en-us\/office365\/troubleshoot\/antispam\/sender-rewriting-scheme\">Sender Rewriting Scheme (SRS) in Office 365 &#8211; Office 365 | Microsoft Docs<\/a><\/p>","protected":false},"excerpt":{"rendered":"<p>Sender -&gt; Forward Server -&gt; ReciepientExchange 2010 uses a Resent-From header that is added to the message while it is being forwarded externally by the forward server [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[3569],"class_list":["post-5284","post","type-post","status-publish","format-standard","hentry","category-research","tag-resent-from"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/pariswells.com\/blog\/wp-json\/wp\/v2\/posts\/5284","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pariswells.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/pariswells.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/pariswells.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/pariswells.com\/blog\/wp-json\/wp\/v2\/comments?post=5284"}],"version-history":[{"count":1,"href":"https:\/\/pariswells.com\/blog\/wp-json\/wp\/v2\/posts\/5284\/revisions"}],"predecessor-version":[{"id":5285,"href":"https:\/\/pariswells.com\/blog\/wp-json\/wp\/v2\/posts\/5284\/revisions\/5285"}],"wp:attachment":[{"href":"https:\/\/pariswells.com\/blog\/wp-json\/wp\/v2\/media?parent=5284"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/pariswells.com\/blog\/wp-json\/wp\/v2\/categories?post=5284"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/pariswells.com\/blog\/wp-json\/wp\/v2\/tags?post=5284"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}