MFMailComposeViewController broke CSS styles in html template

Question

I use MFMailComposeViewController to send a message in html format. If my html template contains the css styles:

<div class="margin:10 10 10 0"> <a href="domain.name">Go To</a></div>

In this case it works good.

But if I send:

<a href="domain.name">Go&nbsp;To</a>

then I see the letter that comes with broken styles as there (3D is not my misprint)

<div style=3D"margin:10 10 10 10;"><a href=3D"www.google.com">Go=C2=A0To</a></div>

Well as the letter goes broken when I insert in the template symbols from national alphabets.

Somebody can tell what the problem and check with yourself?