title: Mail body does not decode on iOS
body: <p>I am trying to send emails using plain SMTP. The mail might contain an attachment so I'm sending it as multipart/mixed. This is, what I am sending:</p>
  <pre><code>Date: 08 Dec 20 07:49:00 +0100
  From: &quot;&quot; &lt;sender@somedomain.com&gt;
  To: my.address@somedomain.com
  X-Priority: 3
  Subject: =?WINDOWS-1252?Q?T=E4st?=
  MIME-Version: 1.0
  Content-Type: multipart/mixed; boundary=&quot;AABCDEFBBCCC0123456789DE&quot;
  
  --AABCDEFBBCCC0123456789DE
  Content-Type: text/html; charset=iso-8859-1
  Content-Transfer-Encoding: quoted-printable
  
  
  =E4=F6=FC$=80 dfg
  --AABCDEFBBCCC0123456789DE--
  .
  </code></pre>
  <p>The message should display as &quot;äöü $€&quot;.</p>
  <p>The problem now is, that every device I checked (Outlook, Gmail, Android) displays the Umlaute correctly. Only iOS does not decode the quoted-printable stuff. It displays the content nicely at the overview but fails when opening the mail.</p>
  <p>Any ideas? Is there something wrong with my syntax? I already tried to use UTF8 and base64 encoding and all combinations, always the same result.</p>
  <p>Thanks for help
  Marco</p>