What happens if you add width=x, as in the following test?
PHP Code:
<div>
<table border="1" style="border-collapse: collapse" cellspacing="4" cellpadding="4">
<tbody><tr>
<td bgcolor="transparent">
<p style="margin-top: 0px; margin-bottom: 0px; margin-left: 0px; margin-right: 0px; text-indent: 0px; background-color: transparent"><span style="font-family: 'tahoma'; background-color: transparent">Maria Anders</span></p></td>
<td bgcolor="transparent">
<p style="margin-top: 0px; margin-bottom: 0px; margin-left: 0px; margin-right: 0px; text-indent: 0px; background-color: transparent"><img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAUAAAAFCAYAAACNbyblAAAAHElEQVQI12P4%0A%20%20%20%20%20%20%20%20//8/w38GIAXDIBKE0DHxgljNBAAO9TXL0Y4OHwAAAABJRU5ErkJggg==" alt="Red dot" width="40"></p></td></tr></tbody></table></div>