CHARSET E-MAIL?

################CABEÇALHO DE E-MAIL#############
###########OBSERVEM A LINHA QUAL CHARSET?#########
From [email protected] Thu Oct 2 09:29:09 2003
Return-Path: <[email protected]>
X-Original-To: [email protected]
Delivered-To: [email protected]
Received: by xxxxx.com.br (Postfix, from userid 89)
id 079D3907D2; Thu, 2 Oct 2003 09:29:08 -0300 (BRT)
From: "FindMailScanner" <[email protected] >
To: [email protected]
Subject: Warning: E-mail viruses detected
Message-Id: <[email protected]>
Date: Thu, 2 Oct 2003 09:29:08 -0300 (BRT)
Status: R Cabeçalho Simples

The following e-mail messages were found to have viruses in them:

Sender: [email protected]
IP Address: 200.162.176.6
Recipient: [email protected] , [email protected]
Subject: =?iso-8859-1?Q?at=E9_explicar...?= ########QUAL CHARSET?
MessageID: 208088472F
Report: No AVI movies allowed (comlbudweise00.mpeg)

--
Sistema de Proteção
Alerta ao Administrador

########### FIM DO CABEÇALHO#######################


Gostaria de saber se alguém sabe o CHARSET para esa budega sair com a acentuação correta no meu cabeçalho dos e-mails? já testei uma penca e estou de saco cheio!