invalid filename when sending email when first character is "é"

[Jorge Costinha]

a simple text email with no attachments at all, just with *é* character 
results in the following error:

"Warning: This message has had one or more attachments removed
Warning: (the entire message).
Warning: Please read the "HCC-mx-Attachment-Warning.txt" attachment(s) 
for more information.

This is a message from the MailScanner E-Mail Virus Protection Service
----------------------------------------------------------------------
The original e-mail attachment "the entire message"
is on the list of unacceptable attachments for this site and has been
replaced by this warning message.

If you wish to receive a copy of the original attachment, please
e-mail helpdesk and include the whole of this message
in your request. Alternatively, you can call them, with
the contents of this message to hand when you call.

At Fri Jun 22 11:43:32 2007 the virus scanner said:
  MailScanner: No programs allowed (msg-18164-12.txt)

Note to Help Desk: Look on the HCC-mx (mx.halla.pt) MailScanner in 
/var/spool/MailScanner/quarantine/20070622 (message l5MAhVa5021067).
"

there is no attachment, how can this mail match the attachment rule? 
sounds like a bug...
im using Mailscanner version : 4.60.8-1 and OS :   Fedora core 6 and RH AS3

thanks.

Jorge