remove the edges that are appearing around the images on Microsoft Outlook

Question

I'm trying to remove the edges that are appearing around the images I'm putting in an html. The images are a hyperlink and when clicked open an email to be answered.

It only happens on the outlook client, and my client has 95% of his employees using the outlook client.

<div>
    <!--[if mso]>
    <v:rect xmlns:v="urn:schemas-microsoft-com:vml" xmlns:w="urn:schemas-microsoft-com:office:word" href="mailto:#$18087$#?subject=Pesquisa de Satisfação - Excelente #RequestNumber#&amp;body=#NÃO MODIFIQUE ESTA LINHA E NEM O ASSUNTO DO EMAIL 10#%0AExcelente! Diga-nos o que você mais gostou:" style="height:80px;v-text-anchor:middle;width:80px;">
        <w:anchorlock/>
        <center>
            <![endif]-->
            <a href="mailto:#$18087$#?subject=Pesquisa de Satisfação - Excelente #RequestNumber#&amp;body=#NÃO MODIFIQUE ESTA LINHA E NEM O ASSUNTO DO EMAIL 10#%0AExcelente! Diga-nos o que você mais gostou:"
                style="color:#ffffff;display:inline-block;font-family:sans-serif;font-size:40px;font-weight:bold;line-height:40px;text-align:center;text-decoration:none;width:40px;-webkit-text-size-adjust:none;"><img src="http://www.grupomoura.com/sistemas-moura/smiling.png" width="40" height="40"></a>
            <!--[if mso]>
        </center>
    </v:rect>
    <![endif]-->
</div>

Answer 1

I believe this may be due to v:rect. According to Microsoft Docs the v:rect has the following trait:

The value is duplicated from the Weight attribute of the Stroke element. If a number is specified, but no units are added, the default unit of measurement is the Emu. If no value is specified, the default is 1 pixel (1px).

This should be solvable by adding strokeweight="0" to the v:rect element.

Note: This is a best guess answer as I don't have access to Outlook to test.