mj-spacer.mjml

<mjml>
  <mj-body>
    <mj-section>
      <mj-column>
        <mj-text>Text</mj-text>
        <mj-spacer />
        <mj-text>Text</mj-text>
        <mj-spacer container-background-color="red" />
        <mj-text>Text</mj-text>
        <mj-spacer css-class="testing" />
        <mj-text>Text</mj-text>
        <mj-spacer height="60px" />
        <mj-text>Text</mj-text>
        <mj-spacer padding="1px" padding-left="3px" />
        <mj-text>Text</mj-text>
        <mj-spacer vertical-align="bottom" />
        <mj-text>Text</mj-text>
        <mj-spacer width="50px" />
        <mj-text>Text</mj-text>
      </mj-column>
    </mj-section>
  </mj-body>
</mjml>