我的应用正在构建纯文本和HTML的电子邮件，但GMail正在显示纯文本部分而不是HTML部分。这是一个生成样本的电子邮件：
Delivered-To: pupeno@pupeno.com
Received: by 10.202.226.2 with SMTP id z2csp41072oig;
Wed, 21 Oct 2015 09:54:39 -0700 (PDT)
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Return-Path: <bounces+2027321-a574-pupeno=pupeno.com@email.carouselapps.com>
Received: from o1.email.carouselapps.com (o1.email.carouselapps.com. [198.21.7.128])
by mx.google.com with ESMTPS id i13si6011737oig.46.2015.10.21.09.54.38
for <pupeno@pupeno.com>
(version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128);
Wed, 21 Oct 2015 09:54:38 -0700 (PDT)
Received-SPF: pass (google.com: domain of bounces+2027321-a574-pupeno=pupeno.com@email.carouselapps.com designates 198.21.7.128 as permitted sender) client-ip=198.21.7.128;
Authentication-Results: mx.google.com;
spf=pass (google.com: domain of bounces+2027321-a574-pupeno=pupeno.com@email.carouselapps.com designates 198.21.7.128 as permitted sender) smtp.mailfrom=bounces+2027321-a574-pupeno=pupeno.com@email.carouselapps.com;
dkim=pass header.i=@carouselapps.com
DKIM-Signature: v=1; a=rsa-sha1; c=relaxed; d=carouselapps.com;
h=from:to:subject:mime-version:content-type; s=s1;
bh=tOXLoNNj+tA5sKyUrxTrMBkqGQ4=; b=Q6rZfviL8wvK5S7zn05O3o+tnzHp7
ohOlidmKSRY6eJcItQsvqQQPUHxGfR/IdKBEpF8aQXCptHzx6/QBiTF6QahozKcz
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for <pupeno@pupeno.com>; Wed, 21 Oct 2015 16:54:29.152 +0000 (UTC)
Date: Wed, 21 Oct 2015 17:54:28 +0100 (BST)
From: Ninja Tools <info@tools.screensaver.ninja>
To: pupeno <pupeno@pupeno.com>
Message-ID: <j2kKE4orTaIPAzuu5NNTdg.1445446468738@postal.enterprise>
Subject: Reset your password for Ninja Tools
MIME-Version: 1.0
Content-Type: multipart/alternative;
boundary="----=_Part_0_1497473158.1445446468708"
User-Agent: postal/1.11.1
X-SG-EID: OKPjcrZQ6zDhIRONmJRumzza0qf5A75AqxbEBKEWUbq4dRn30/O1kqcj+YBUC+lbjYMywbswqYg7Qh
RQW+GwImU2lbSyt8hhxbLjmPoYyDpgK8fw4j9gyRo6iN3Ifa6WXnIc19Wgt8ckU+k3Ia98r9m74+uq
UP5oIuLP/0QrO2c=
------=_Part_0_1497473158.1445446468708
Content-Type: text/html; charset=us-ascii
Content-Transfer-Encoding: 7bit
<p>Hello pupeno</p>
<p>We just received a request to reset your password for Ninja Tools. If you requested it, go ahead and
<a href="http://links.carouselapps.com/wf/click?upn=WfPzVLtb7ZF35VAdtBHlPvSQvCzieCVyZbs3rAQB-2F3b4FEWT6XE-2F5IT5D7g8XqMsWbVR0RLAOhF7yR9BCW6sg75Dp2sRKl-2FRgqE8gYDigkp0rl-2FRQr3ZBALDyTSWMY84_H-2FlUQYAvQPwDWbL-2FScCT8JuGY0xejfYki4Bcr-2F29kvOaFEyLudYEogQpRlVyY72hMcXzoSJtZs1jqx-2FezjofLTqaYlVMMbijAqWWwUGmbbSleIrNBjtJIFr3aZTGFGb0A84kijruYdrr28Ux5b-2FKY4o4p2IQryVKRxJlHm6Uq6CZFrlbft3-2FzVvgTFCmDcMB-2BqNYJ9fvnEpXQO3DBfG6xw-3D-3D">change your password</a>.</p>
<p>If it wasn't you, it's probably nothing to worry about, but you can change your password if you want. We recommend
using long random passwords that are impossible to guess, generated by one of the many tools for this purpose.</p>
<p>--<br/>
<a href="http://links.carouselapps.com/wf/click?upn=aOZ8fPA8TW6xA-2FK-2FYLRnf6pYmLjc3DT199mO9iLMlb-2BwBDAOJfISw0s-2FCqQ5XiNd_H-2FlUQYAvQPwDWbL-2FScCT8JuGY0xejfYki4Bcr-2F29kvOaFEyLudYEogQpRlVyY72hf07emq5eDBLFNRYWfauKdadaeOkonVSXkr44a2TsLAwfGvVKNTgV-2BQftjAORHK4eqJJNBbsRgHaZerIZCV-2FuE2aQCEVqHKzjuYrgw9-2BNJYYYNZhzhDKYXAemcLXg2DONFOMMyAisrJ4sZtAg7Ul9Rg-3D-3D">The Ninja Tools team<br/>
tools.screensaver.ninja</a></p>
<img src="http://links.carouselapps.com/wf/open?upn=H-2FlUQYAvQPwDWbL-2FScCT8JuGY0xejfYki4Bcr-2F29kvOaFEyLudYEogQpRlVyY72hneRNq82X61ObdxFETqc6Fs7FKZMztlkd6uWh4LFi7chevjbn4gwRY5bASZDbTuzhgxOj0Hi-2FuCiMJCX8Ct3egGOqidXFik-2FWi-2F5r8w7CWUzpZvlMJnTmQs-2Fef1QyiuE3A9tuex-2B-2F-2BLIDoKhAwnxz8pNyCpnX8U5JVqNlydpAhiw-3D" alt="" width="1" height="1" border="0" style="height:1px !important;width:1px !important;border-width:0 !important;margin-top:0 !important;margin-bottom:0 !important;margin-right:0 !important;margin-left:0 !important;padding-top:0 !important;padding-bottom:0 !important;padding-right:0 !important;padding-left:0 !important;"/>
------=_Part_0_1497473158.1445446468708
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
Hello pupeno,
We just received a request to reset your password for Ninja Tools. If you requested it, go to
http://links.carouselapps.com/wf/click?upn=WfPzVLtb7ZF35VAdtBHlPvSQvCzieCVyZbs3rAQB-2F3b4FEWT6XE-2F5IT5D7g8XqMsWbVR0RLAOhF7yR9BCW6sg75Dp2sRKl-2FRgqE8gYDigkp0rl-2FRQr3ZBALDyTSWMY84_H-2FlUQYAvQPwDWbL-2FScCT8JuGY0xejfYki4Bcr-2F29kvOaFEyLudYEogQpRlVyY72h16QDQLQ3Y-2BAwzKSTkHHzzQU8t5NMDhhwFxr-2F9kPJnrpNWf6bVxL-2B3kECV2sts-2Bhs7B4xqorGBxtneHsySFrAt-2FmbHS1C9j4O2pNSoP2dEhp-2B0w2jLrXHf33RIEnZf19evu4H-2BC9k6zjgzxaDIZQfhg-3D-3D
and set a new password.
If it wasn't you, it's probably nothing to worry about, but you can change your password if you want. We recommend using
long random passwords that are impossible to guess, generated by one of the many tools for this purpose.
--
The Ninja Tools team
http://links.carouselapps.com/wf/click?upn=z585DblkaMQy4JfRqwCa4OVAx8ziqEgRXDflOVJFKdB-2F9oZCqNqfkkoKugMxgyzH_H-2FlUQYAvQPwDWbL-2FScCT8JuGY0xejfYki4Bcr-2F29kvOaFEyLudYEogQpRlVyY72h-2BGkBmxTO1QKUGbbWcp2ur1bXMQCsapPIB9JTm2TpH6AzlTKnRjNocUYmBMOx9VP-2BzaKLweZ56O5sLXW5P-2F9-2BGdAnIFF03EgATc2bgZW6Cz9ZpUFBbdrYbcSrQN07G-2BtyJilqYNGqGLkBOPZLY8-2BV3A-3D-3D
------=_Part_0_1497473158.1445446468708--
它有什么问题吗？
我用来生成代码的代码是：
(mailer/deliver-email {:to (str (user-schema/display-name user) " <" (:email user) ">")
:subject "Reset your password for Ninja Tools"}
"templates/email/reset-password.html.mustache" template-vars :text/html
"templates/email/reset-password.txt.mustache" template-vars :text/plain)))