Rails mailer mimepart visible as text in message body

Question

I'm sending test mail using ActionMailer. The template is being rendered and mail is being delivered fine. The only problem is the mimepart and other header data is displayed by Google in message body.

Here is the code that mails..

def testing

    mail(:to => "[email protected]",:subject => "html mailer", :content_type => "text/html") do |format|
          format.html { render 'testing' }
          format.text { render :text => "bing" }
    end
end

and Here's the email received.

----==_mimepart_508fd46252b8c_8023fe595835ad0479a6 Date: Tue, 30 Oct 2012 18:51:38 +0530     
Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit
Content-ID: <508fd46254ea7_8023fe595835ad0480b8@Apoorv-Parijats-MacBook-Pro-2.local.mail> 
bing ----==_mimepart_508fd46252b8c_8023fe595835ad0479a6 Date: Tue, 30 Oct 2012 18:51:38 
+0530 Mime-Version: 1.0 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding:  
7bit Content-ID: <508fd46256465_8023fe595835ad04819c@Apoorv-Parijats-MacBook-Pro-
2.local.mail> Hi bing
column 1    column 2
----==_mimepart_508fd46252b8c_8023fe595835ad0479a6--

Output of the console -

 Loading development environment (Rails 3.2.2)
 1.9.3-p125 :001 > RankMailer.testing.deliver
 I, [2012-10-30T18:51:38.331238 #2050]  INFO -- :   Rendered rank_mailer/testing.html.erb           
 (1.8ms)
 I, [2012-10-30T18:51:38.333117 #2050]  INFO -- :   Rendered text template (0.0ms)
 I, [2012-10-30T18:51:45.824962 #2050]  INFO -- : 
 Sent mail to [email protected] (7484ms)
 D, [2012-10-30T18:51:45.825125 #2050] DEBUG -- : Date: Tue, 30 Oct 2012 18:51:38 +0530
 From: [email protected]
 To: [email protected]
        Message-ID: <508fd462572ec_8023fe595835ad0482c0@Apoorv-Parijats-MacBook-Pro-2.local.mail>
    Subject: html mailer
    Mime-Version: 1.0
    Content-Type: text/html;
     charset=UTF-8
    Content-Transfer-Encoding: 7bit



    ----==_mimepart_508fd46252b8c_8023fe595835ad0479a6
    Date: Tue, 30 Oct 2012 18:51:38 +0530
    Mime-Version: 1.0
    Content-Type: text/plain;
     charset=UTF-8
    Content-Transfer-Encoding: 7bit
    Content-ID: <508fd46254ea7_8023fe595835ad0480b8@Apoorv-Parijats-MacBook-Pro-2.local.mail>

    bing

    ----==_mimepart_508fd46252b8c_8023fe595835ad0479a6
    Date: Tue, 30 Oct 2012 18:51:38 +0530
    Mime-Version: 1.0
    Content-Type: text/html;
     charset=UTF-8
    Content-Transfer-Encoding: 7bit
    Content-ID: <508fd46256465_8023fe595835ad04819c@Apoorv-Parijats-MacBook-Pro-2.local.mail>

    Hi bing

    <table style="border:1px solid red">
        <tr>
            <td>column 1</td>
            <td>column 2</td>
        </tr>
    </table>

    ----==_mimepart_508fd46252b8c_8023fe595835ad0479a6--

     => #<Mail::Message:70255316899740, Multipart: false, Headers: <Date: Tue, 30 Oct 2012 18:51:38 +0530>, <From: [email protected]>, <To: [email protected]>, <Message-ID: <508fd462572ec_8023fe595835ad0482c0@Apoorv-Parijats-MacBook-Pro-2.local.mail>>, <Subject: html mailer>, <Mime-Version: 1.0>, <Content-Type: text/html>, <Content-Transfer-Encoding: 7bit>>

Answer 1

Don't specify :content_type => "text/html" in your mail method. Since you're using format block, rails will automatically pick up mime type.

MORE DETAILS:

Try this to send out multipart email (ie. both html and text formats of email). Notice the order of formats.

mail(:to => "[email protected]", :subject => "html mailer") do |format|
    format.text { render :text => "bing" }
    format.html { render 'testing' }
end