Best way to allow attachments with it5 extension through

[Daniel Straka]

I've scoured the MailScanner list archives for an answer and have come up with several answers. 
I'm looking for a quick and easy solution to allow attached files with the extension .it5 through.
Right now they're being  returned with the following message:

---------------------------
Subject:	Warning: E-mail viruses detected		

Our e-mail content detector has just been triggered by a message you sent:

One or more of the attachments (land.it5) are on
the list of unacceptable attachments for this site and will not have
been delivered.

Consider renaming the files to avoid this constraint.

The virus detector said this about the message:
Report: Report: MailScanner: No programs allowed (land.it5)

-- 
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Casper College
www.caspercollege.edu 

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-----------------------------------

Dan Straka
Systems Coordinator
Casper College
307.268.2399



-- 
This message has been scanned for viruses
and dangerous content by MailScanner at
caspercollege.edu and is believed to be clean.

-------------- next part --------------
BEGIN:VCARD
VERSION:2.1
FN:Straka, Daniel
TEL:307.268.2399
EMAIL:Dstraka at caspercollege.edu
ORG:Casper College
TITLE:Systems Coordinator
URL:http://wind.caspercollege.edu/~dstraka/
END:VCARD