How to using u00C7, u00C3 and others caracters in Mail Adapter

Hi

I have a interface to get messages from email and call a RFC.

Is occurs the following problem: when exists special caracters as ç, á, ã, é and others, this caracters are changed by #.

I think that this occurs because the encoding in XML message is UTF-8, but I don't know where I change it.

Example:

Message before XI: Instalações Térmicas

Message after XI: Instala##es T#rmicas

The fist line of XML is: <?xml version="1.0" encoding="UTF-8" ?>

Thanks.