mj-column-padding.mjml

<mjml>
  <mj-body>
    <mj-section>
      <mj-column padding-top="5px">
        <!-- Your first column -->
      </mj-column>
      <mj-column padding-left="4px">
        <!-- Your second column -->
      </mj-column>
    </mj-section>
    <mj-section>
      <mj-column padding="3px">
        <!-- Your first column -->
      </mj-column>
      <mj-column padding-right="2px">
        <!-- Your second column -->
      </mj-column>
      <mj-column padding-bottom="1px">
        <!-- Your third column -->
      </mj-column>
    </mj-section>
  </mj-body>
</mjml>