FBD:EMAIL-File Type Not Allowed

[FBD Virus filter <novirus@cmpsolv.com>]

  Email sent by (debian-user@lists.debian.org) at IP 218.163.150.54
  addressed to (bob@cavu.com)
  with subject (Subject: Re: Re: Thanks!)
  has been blocked on FBD in /var/spool/smtpd/badfname/smtpdIsrgO0
  because of a dangerous attachment file name, due to
  dangerous extension.
  This has been done because it could be a new virus that is not yet
  in our database.
  

  Please correct the attachment file name in the attachment and resend,
  if you are the sender.

  The dangerous extension in attachment file name trigger was:

filename: bad extension: document.pif

  
  
Note that if any of the following characters are part of a file name (except
that '/' and '\' are allowed in archives), it is considered a virus:

     !*|";<>{}/`\
     tab or newline

Non-printable characters are represented by 'Z' characters.

  Non-infected attachments, if any, can be recovered on request if
  policy and time allows and justification can be made.

  If you know the sender (debian-user@lists.debian.org) at IP 218.163.150.54,
  you should warn the sender that their system may be infected and that
  they should run a virus scanner, rebuild their system, or take
  other action to remove their infection.

  If they are sending legitimate data to you, perhaps they could send
  it as ordinary text that will not get filtered as suspicious.

  If you do NOT know the sender then likely he is an infected spammer 
  or hacker so you should not send him or her email.
  Your system was not harmed as this virus was blocked.
  
  This email was automatically generated.  Please do not reply to it directly.
  Send all responses, including questions, to (bob@verysecurelinux.com).

  Best regards,
  FBD/Cmpsolv Network Security,
  FBD

  For more information, contact bob@verysecurelinux.com

  The text portion of the email was:
CLEANED: Here is the file.