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Editorial Team
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Asked: 2026-05-24T16:24:04+00:00

I want to send html email’s with my Rails Mailer. Could be multipart/alternative or

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I want to send html email’s with my Rails Mailer.
Could be multipart/alternative or only text/html.
Problem is, when I send an email with a link, it appears well on Gmail, but not so good in Thunderbird.

The problem is, that in Thunderbird, the link is ‘not clickable’ – it’s highlighted like a link, but clicking on it does nothing.

Links on other mails (not sent from Rails Mailer) work flawlessly.

So my question is: how to properly send an html email, so it will be viewed properly?

Mailer code:

class MyMailer < ActionMailer::Base
  def mailing_delivery(email, subject)
    mail(:to => email, :subject => subject)
  end

Mail view:

# mailing_delivery.html.haml 
%p
  Thanks! Its your mailer!
%p
  = link_to "Google", "google.com"

Source of email (some parts cut-out):

Date: Thu, 18 Aug 2011 14:32:34 +0200
From: xxx
To: xxx
Message-ID: <4e4d0662bf96e_41024be957a57974@xxx.mail>
Subject: Super news!
Mime-Version: 1.0
Content-Type: text/html;
 charset=UTF-8
Content-Transfer-Encoding: 7bit
X-O2-Trust: 2, 64
X-O2-SPF: neutral

<p>
  Thanks! It's your mailer!
</p>
<p>
  <a href="google.com">Google</a>
</p>

Of course Rails 3. Thunderbird 5.0, but that’s not the issue – because somehow other mails show up good.. And I don’t think it’s app specific.

What should I do, to make this work?

Edit: I tried to change the ‘content-transfer-encoding’ header with no success, by doing mail(:to => email, :subject => subject, "Content-Transfer-Encoding" => value) or in class default "Content-Transfer-Encoding" => value with no luck.. how to change that?

Emails that works good under Thunderbird have Content-Transfer-Encoding: quoted-printable (or eventually base64) so maybe that’s the issue? How do I change it?

Edit 2: I managed to change the Content-Transfer-Encoding to quoted-printable but it’s cutting the content, like this:

Date: Thu, 18 Aug 2011 22:04:21 +0200
From: xxx
To: xxx
Message-ID: <4e4d704557839_151c4e4957c2132e@xxx.mail>
Subject: Super news!
Mime-Version: 1.0
Content-Type: text/html;
 charset=UTF-8
Content-Transfer-Encoding: quoted-printable
X-O2-Trust: 2, 63
X-O2-SPF: neutral

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://ww=
w.w3.org/TR/html4/loose.dtd">
<html>
  <body>
    <p>
      Thanks! It's your mailer!
    </p>
    <p>
      <a href=

One other thing: why is there a newline in Content-Type ? I didn’t see it in other (working good) mails. How I can get rid of it?

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1 Answer

  1. Editorial Team

    Maybe it’ll work if you fix your html. So instead of just having:

    <p>
  Thanks! It's your mailer!
</p>
<p>
  <a href="google.com">Google</a>
</p>

    try:

    <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
  <body>
    <p>
      Thanks! It's your mailer!
    </p>
    <p>
      <a href="http://google.com">Google</a>
    </p>
  </body>
</html>
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