[Evolution] Unknown encoding

[Armin Bauer <azrael desscon com>]

Hi,

what could this problem cause:

Trying to send a eMail to certain people they just receive something
like this:

From: Mysqlf [mailto:me blubb com]
Sent: Tuesday, July 01, 2003 9:53 AM
To: bla bla com
Subject: Something


This message uses a character set that is not supported by the Internet
Service.  To view the original message content,  open the attached message.
If the text doesn't display correctly, save the attachment to disk, and then
open it using a viewer that can display the original character set. 
 <<message.txt>> 

In the message.txt attachment is the original message together with the orginial
attachment.

We are using the standard ISO-8859-1 encoding. Another strange thing is the
X-Mailer the other person used:
X-Mailer: Internet Mail Service (5.5.2653.19)

Can someone give me a hint about this? Is this an old Exchange Server?
Can this be solved by switching the encoding to UTF-8?

Armin Bauer