HTML emails in Ultimate Member

Hi,

I’m getting HTML code instead of HTML rendered result when UM sends an email. Why?

Example:

<div style="max-width: 560px; padding: 20px; background: #ffffff; border-radius: 5px; margin: 40px auto; font-family: Open Sans,Helvetica,Arial; font-size: 15px; color: #666;">
<div style="color: #444444; font-weight: normal;">
<div style="text-align: center; font-weight: 600; font-size: 26px; padding: 10px 0; border-bottom: solid 3px #eeeeee;">{site_name}</div>
<div style="clear: both;">?</div>
</div>
<div style="padding: 0 30px 30px 30px; border-bottom: 3px solid #eeeeee;">
<div style="padding: 30px 0; font-size: 24px; text-align: center; line-height: 40px;">Thank you for signing up!<span style="display: block;">Your account is now active.</span></div>
<div style="padding: 10px 0 50px 0; text-align: center;"><a style="background: #555555; color: #fff; padding: 12px 30px; text-decoration: none; border-radius: 3px; letter-spacing: 0.3px;" href="{login_url}">Login to our site</a></div>
<div style="padding: 20px;">If you have any problems, please contact us at {admin_email}</div>
</div>
<div style="color: #999; padding: 20px 30px;">
<div>Thank you!</div>
<div>The <a style="color: #3ba1da; text-decoration: none;" href="{site_url}">{site_name}</a> Team</div>
</div>
</div>

Regards,
Deryck.