mj-image-padding.mjml

<mjml>
  <mj-body>
    <mj-section>
      <mj-column>
        <mj-image padding="10px" src="http://www.online-image-editor.com//styles/2014/images/example_image.png" />
      </mj-column>
      <mj-column>
        <mj-image padding="10px 15px 12px" src="http://www.online-image-editor.com//styles/2014/images/example_image.png" />
      </mj-column>
    </mj-section>
    <mj-section>
      <mj-column>
        <mj-image padding-top="1px" src="http://www.online-image-editor.com//styles/2014/images/example_image.png" />
      </mj-column>
      <mj-column>
        <mj-image padding-right="2px" src="http://www.online-image-editor.com//styles/2014/images/example_image.png" />
      </mj-column>
    </mj-section>
    <mj-section>
      <mj-column>
        <mj-image padding-bottom="3px" src="http://www.online-image-editor.com//styles/2014/images/example_image.png" />
      </mj-column>
      <mj-column>
        <mj-image padding-left="4px" src="http://www.online-image-editor.com//styles/2014/images/example_image.png" />
      </mj-column>
    </mj-section>
  </mj-body>
</mjml>