How to change the mailer Content-Transfer-Encoding settings in Rails?

user_117191 0
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The 'Content-Transfer-Encoding' setting is set to '7bit' by default. The mail server Postfix is breaking down the email header by bunch of 1000 caracteres, meaning that if you have a long email (using HTML for example), you end up having spaces in the middle of your text or links. (See this thread for more info: http://tech.groups.yahoo.com/group/postfix-users/message/273296)

Following the Rails ActionMailer documentation (http://api.rubyonrails.org/classes/ActionMailer/Base.html), adding the following code to my app file should make it, but it doesn't work:

ActionMailer::Base.default 'Content-Transfer-Encoding' => 'quoted-printable'

I still end up with the default:

Mime-Version: 1.0
Content-Type: multipart/alternative;
 boundary="--==_mimepart_50166adf1e043_1b9810829142282d";
 charset=UTF-8
Content-Transfer-Encoding: 7bit

My email look like that:

def new_registered_user(user_id) 
    @user = User.find(user_id)

    set_locale @user.locale

    mail(
      :subject => i18n_subject,
      :to => @user.email_with_name
    ) do |format|
      format.text { render :layout => 'text_email' }
      format.html
    end
  end

Any idea on what else should I change?

postfix-mta actionmailer ruby-on-rails
3 Answers

I also ran into this problem recently. Rails was defaulting to quoted-printable, but that was causing rendering problems for me in a webmail client. New lines were rendered as =0D, which the webmail client rendered incorrectly.

My solution to this was the alter the content encoding of only the html part since I'm also sending a separate text part and do not want to change its encoding. The html method takes a content_transfer_encoding argument, avoiding the need for a temporary variable:

mail do |format|
  format.text { ... }
  format.html(content_transfer_encoding: '7bit') { ... }
end

The documentation references using default 'Content-Transfer-Encoding' ... but that only works when not calling the mail method directly.

user_7176260
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