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My Rails 3 application sends out emails in both plain text and HTML formats. I have tested it locally using RoundCube and Squirrel Mail clients and they both display HTML version with images, links, etc. GMail on the other hand chooses plain text format. Any idea what's causing this? Delivered-To: test@gmail.com Received: by 10.42.166.2 with SMTP id m2cs16081icy; Thu, 3 Mar 2011 17:01:48 -0800 (PST) Received: by 10.229.211.138 with SMTP id go10mr1544841qcb.195.1299200507499; Thu, 03 Mar 2011 17:01:47 -0800 (PST) Return-Path: <info@example.com> Received: from beta.example.com (testtest.test.com [69.123.123.123]) by mx.google.com with ESMTP id j14si1690118qcu.136.2011.03.03.17.01.46; Thu, 03 Mar 2011 17:01:46 -0800 (PST) Received-SPF: neutral (google.com: 69.123.123.123 is neither permitted nor denied by best guess record for domain of info@example.com) client-ip=69.123.123.123; Authentication-Results: mx.google.com; spf=neutral (google.com: 69.123.123.123 is neither permitted nor denied by best guess record for domain of info@example.com) smtp.mail=info@example.com Received: from localhost.localdomain (localhost [127.0.0.1]) by beta.example.com (Postfix) with ESMTP id F3C273A3EC for <test@gmail.com>; Fri, 4 Mar 2011 01:01:45 +0000 (UTC) Date: Fri, 04 Mar 2011 01:01:45 +0000 From: info@example.com To: test@gmail.com Message-ID: <4d7039f9e9d3e_3449482ab7831658@test.mail> Subject: Your example account was activated. Mime-Version: 1.0 Content-Type: multipart/alternative; boundary="--==_mimepart_4d7039f9e6967_3449482ab7831370"; charset=UTF-8 Content-Transfer-Encoding: 7bit ----==_mimepart_4d7039f9e6967_3449482ab7831370 Date: Fri, 04 Mar 2011 01:01:45 +0000 Mime-Version: 1.0 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: 7bit Content-ID: <4d7039f9e95ed_3449482ab7831519@test.mail> <html> <head> <meta content="text/html; charset=UTF-8" http-equiv="Co

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