UTL_SMTP subject error

I am trying to send mail using utl_smtp. Body is sent fine . Subject is not fine

Subject Sent :  Boleto Bancário - Reed Exhibitions - Pedido 100800000016

subject received in the mail : Boleto Banc=C3=A1rio - Reed Exhibitions - Pedido de Venda: 100800000016

subject contains =C3=A1. It should not come. Subject is a mix of Portugese+english+number

procedure code used for the subject is

write_mime_header(conn, 'Subject', UTL_RAW.CAST_TO_VARCHAR2(utl_encode.QUOTED_PRINTABLE_ENCODE(UTL_RAW.CAST_TO_RAW(subject))));

PROCEDURE write_mime_header

(

 conn IN OUT NOCOPY utl_smtp.connection,

 name IN VARCHAR2,