If you use HTML code in your Email Script token, Marketo displays this code in the text-only version of you email.
Example:
Your Email Script token has
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr>
<td align="left">
<p>Some text</p>
</td>
</tr>
</table>
And be sure your customers will see the same code (not only "Some text") in the text-only version.
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