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Email: Attachment Filtering Guideline

The University's electronic mail systems automatically block email messages with certain types of attachments that may contain computer viruses, worms, or other potentially harmful software code.

Restricted File Extensions

Email messages that originate within or outside of the University's email system will be automatically blocked if they contain an executable attachment. The sender will receive an email notification explaining that the message has not been delivered to the intended recipient. Common types of executable attachments are listed in the table below.

Extension

Description

.asp

Active server pages

.bas

BASIC source code

.bat

batch file

.chm

Ares Font Chameleon Source Font

.class

Java class file

.cmd

command file

.com

DOS/Windows executable file

.cpl

Windows Control Panel

.crt

Certificate file

.exe

executable

.fon

Generic font file

.hlp

Windows Help File

.hta

Herma Thumbnail Archive

.inf

Installation script

.ini

Windows initialization file

.ins

Installation script

.isp

IIS Service Provider Settings

.iw

IBM Updater file

.js

JavaScript file

.jse

Encoded JavaScript file

.msc

Microsoft Management Console Snap-in

.msi

Microsoft Installer

.msp

MS Paint Bitmap

.mst

ChemFinder Chemical Structure Index

.pif

program information file

.pcd

Photo-CD Image

.reg

Registry

.scr

screen saver

.sct

FoxPro screen

.shb

Corel Background file

.shs

Shell Scrap Object

.vb

Visual Basic source file

.vbe

Encoded Visual Basic script

.vbs

Visual Basic Script file

.ws

1-2-3 Word Search Maker

.wsc

Windows scripting host

.wsf

Windows scripting host

.wsh

Windows scripting host

Attachments Containing Archive Files

If an attached archive file contains executable content, the email message will not be delivered to your Inbox. It will be automatically blocked, and the sender will receive an email notification explaining that the message has not been delivered to the intended recipient. The table above contains a list of common types of executable attachments.

Keep in mind that the most common file types (like Word documents and PDF files) will not be blocked if they are attached in an archive file.