[mew-int 2815] Encoding issues at Summary Mode

Hello again,

While at (Draft) or (Summary), emacs tells me that it's using
ctext-unix coding system. Isn't suppose to use utf-8?

Nonetheless, when I am browsing through the Summary mode, in the right
side of the screen, where the initial text of the e-mail's body are
shown, some text are rendered right and others are not.

For example, the letter "é" is sometimes shown as "=E9". I think this
might be because each e-mail has been encoded differently but the
whole buffer needs to use just one encoding. Is this right? Is there a
way to fix it so all the initial e-mail's body are shown correctly?

I am using the git version (7.0.50) on Emacs 23.1.

Thank you.

-- 
Diogo F. S. Ramos