title: Send base64 image using nodemailer
body: <p>Here is how I'm try to send html email with base64 image using nodemailer.</p>
  
  <pre><code>html: `&lt;img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAUAAAAFCAYAAACNbyblAAAAHElEQVQI12P4//8/w38GIAXDIBKE0DHxgljNBAAO9TXL0Y4OHwAAAABJRU5ErkJggg==" /&gt;`,
  </code></pre>
  
  <p>but instead of original html I receive email with following:</p>
  
  <pre><code>&lt;img src=3D"data:image/png;base64,=
  iVBORw0KGgoAAAANSUhEUgAAAAUAAAAFCAYAAACNbyblAAAAHElEQVQI12P4//8/w38GIAXDIBK=
  E0DHxgljNBAAO9TXL0Y4OHwAAAABJRU5ErkJggg=3D=3D" /&gt;
  </code></pre>
  
  <p>where/what adds these "3D" and how to send right base64 image?
  Thank you</p>