[ic] Warning: Attachment type not allowed

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Our attachment detector has just been triggered by a message you sent:
  To: housing at csuchico.edu
  Subject: Re: Your letter
  Date: Tue Mar 23 14:03:35 2004

One or more of the attachments are on the list of unacceptable attachments
for this site and will not have been delivered.

The attachment detector said this about the message:
Report: MailScanner: Shortcuts to MS-Dos programs are very dangerous in email (your_letter.pif)