Rails escapes HTML in my plain text mails

I am using the rails 3.2.5 ActionMailer to send plain text mails. Given I have a mail view like this:

message_from_user.text.erb:

Hi <%= @recipient.name %>,

You got the following message from <%= @sender.name %>:

<%= @message %>

When @message is "quotes & ampersands", then the plain text mail contains "quotes & ampersands". So it seems like rails just treats this as a HTML view and escapes any html in order to prevent cross site scripting. However this is a plain text mail. The extension is .text.erb and ActionMailer detectes this and sets the MIME to text/plain. So I never want to escape any html in it.

I have quite a few mail templates in my application, they are all plain text. I would consider patching all of them to include <%=raw @message%> or <%= @message.html_safe %> bad style - not very DRY.

I tried varios work-arounds that included money patching Erubis. None of them seem to work. I am looking for some patch or config option or anything to disable escaping html for all .text.erb files.

Any help is greatly appreciated!