Rails - May 2013 - ActionMailer: Remove Content-ID from multipart emails

Hi,

Already asked this question in StackOverflow, but as not responses arrive, 
decided to give it a try here :)

I''m using action mailer to send emails with both html and plain text 
version.

Something like this:

    mail(:to =>
''example-hcDgGtZH8xNBDgjK7y7TUQ@public.gmane.org'', :subject
=> ''Test message'', :from =>
''sender-hcDgGtZH8xNBDgjK7y7TUQ@public.gmane.org'') do |format|
      format.text { render :text => ''test2'' }
      format.html { render :inline =>
''<p>test</p>'' }
    end

In my real application, i''m also not using templates because the
content of
the email comes entirely from the database.

Is there a way to remove the Content-ID from the generated email? I ask 
this because i identified that this Content-ID cause some issues with email 
clients like Zimbra ( http://www.zimbra.com/ ).

In this case, the *text part* is identified as an attachment.

A sample email that is sent ( without all headers to reduce the size ):

Subject: Test message
Mime-Version: 1.0
Content-Type: multipart/alternative;
 boundary="--==_mimepart_51968c0793776_ae993feec08349d036897";
 charset=UTF-8
Content-Transfer-Encoding: 7bit



----==_mimepart_51968c0793776_ae993feec08349d036897
Date: Fri, 17 May 2013 16:59:03 -0300
Mime-Version: 1.0
Content-Type: text/html;
 charset=UTF-8
Content-Transfer-Encoding: 7bit
Content-ID:
<51968c07954fb_ae993feec08349d0370d-l6jnvH79UUvwwNc1L8eyVw@public.gmane.org>

<p>test</p>

----==_mimepart_51968c0793776_ae993feec08349d036897
Date: Fri, 17 May 2013 16:59:03 -0300
Mime-Version: 1.0
Content-Type: text/plain;
 charset=UTF-8
Content-Transfer-Encoding: 7bit
Content-ID:
<51968c0794e19_ae993feec08349d036917-l6jnvH79UUvwwNc1L8eyVw@public.gmane.org>

test2

----==_mimepart_51968c0793776_ae993feec08349d036897--


See the "Content-ID:
<51968c0794e19_ae993feec08349d036917-l6jnvH79UUvwwNc1L8eyVw@public.gmane.org>"?
I
need to remove it.

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