title: In quoted-printable, what constitutes a line break according to the 76 character rule?
body: <p>While <a href="https://www.rfc-editor.org/rfc/rfc2045#page-19" rel="nofollow noreferrer">the RFC 2045</a> clearly states that a line in quoted-printable (QP) must not be longer than 76 characters, in the real-world not every client seems to follow this requirement. Or could it be I misunderstand the requirement from the RFC?</p>
  <p>Consider the following few lines from a real-world mail message:</p>
  <pre><code>&lt;style type=3D&quot;text/css&quot;&gt;=0Abody,td { color:#2f2f2f; font:11px/1.35em Verdana, Arial, Helvetica, sans-serif; }=0A&lt;/style&gt;=0A&lt;body style=3D&quot;background:#F6F6F6; font-family:Verdana, Arial, Helvetica, sa=
  ns-serif; font-size:12px; margin:0; padding:0;&quot;&gt;=0D=0A&lt;div style=3D&quot;background:#F6F6F6; font-family:Verdana, Arial, Helvetica, sans-serif; font-size:12px; margin:0; padding:0;&quot;&gt;=0D=0A&lt;table cellspacin=
  g=3D&quot;0&quot; cellpadding=3D&quot;0&quot; border=3D&quot;0&quot; width=3D&quot;100%&quot;&gt;=0D=0A&lt;tr&gt;=0D=0A    &lt;td align=3D&quot;center&quot; valign=3D&quot;top&quot; style=3D&quot;padding:20px 0 20px 0&quot;&gt;=0D=0A        &lt;!-- [ header starts here] --&gt;=0D=0A       =
  </code></pre>
  <p>Each line is 201 characters plus the CRLF. However, there are several <code>=0A</code> sequences which translate to LF. So does that mean I need to be able to parse this message or can I reject it?</p>
  <p>It seems to me that it violates the following statement from the RFC, but I am not 100% certain:</p>
  <pre><code>(5)   (Soft Line Breaks) The Quoted-Printable encoding
        REQUIRES that encoded lines be no more than 76
        characters long.  If longer lines are to be encoded
        with the Quoted-Printable encoding, &quot;soft&quot; line breaks
        must be used.  An equal sign as the last character on a
        encoded line indicates such a non-significant (&quot;soft&quot;)
        line break in the encoded text.
  </code></pre>