Attachments blocked by Wesleyan’s mail servers

E-mail is a means of spreading viruses and worms.  Scanning for viruses and worms is essential in mitigating the risk of an outbreak within Wesleyan’s network.  In addition to virus scanning, some types of file attachments are considered potentially dangerous enough to strip them from messages that pass through our servers in all cases.  Below is a list of files that Wesleyan’s mail servers block.  Files are blocked if the file extension (the three letters to the right of the dot) matches an entry in the table below.

File name extension

File type

.ade Access Project
Extension (Microsoft)
.adp Access Project
.app Executable
.asp Active Server Page
.bas BASIC Source Code
.bat Batch Processing
.cer Internet Security
Certificate File
.chm Compiled HTML Help
.cmd DOS CP/M Command
File, Command File for Windows NT
.cnf Config file used by Telnet, Windows and other applications
.com Command
.cpl Windows Control
Panel Extension (Microsoft)
.crt Certificate File
.csh csh Script
.der DER Encoded X509
Certificate File
.exe Executable File
.fxp FoxPro Compiled
Source (Microsoft)
.gadget Windows Vista
.hlp Windows Help File
.hta Hypertext
.inf Information or
Setup File
.ins IIS Internet
Communications Settings (Microsoft)
.isp IIS Internet
Service Provider Settings (Microsoft)
.its Internet Document
Set, Internet Translation
.js JavaScript Source
.jse JScript Encoded
Script File
.ksh UNIX Shell Script
.lnk Windows Shortcut
.mad Access Module
Shortcut (Microsoft)
.maf Access (Microsoft)
.mag Access Diagram
Shortcut (Microsoft)
.mam Access Macro
Shortcut (Microsoft)
.maq Access Query
Shortcut (Microsoft)
.mar Access Report
Shortcut (Microsoft)
.mas Access Stored
Procedures (Microsoft)
.mat Access Table
Shortcut (Microsoft)
.mau Media Attachment
.mav Access View
Shortcut (Microsoft)
.maw Access Data Access
Page (Microsoft)
.mda Access Add-in
(Microsoft), MDA Access 2 Workgroup (Microsoft)
.mdb Access Application
(Microsoft), MDB Access Database (Microsoft)
.mde Access MDE Database
File (Microsoft)
.mdt Access Add-in Data
.mdw Access Workgroup
Information (Microsoft)
.mdz Access Wizard
Template (Microsoft)
.mhtml MHTML document (MIME)
.msc Microsoft
Management Console Snap-in Control File (Microsoft)
.msh Microsoft Shell
.msh1 Microsoft Shell
.msh2 Microsoft Shell
.mshxml Microsoft Shell
.msh1xml Microsoft Shell
.msh2xml Microsoft Shell
.msi Windows Installer
File (Microsoft)
.msp Windows Installer
.mst Windows SDK Setup
Transform Script
.ops Office Profile
Settings File
.pcd Visual Test
.pif Windows Program
Information File (Microsoft)
.plg Developer Studio
Build Log
.prf Windows System File
.prg Program File
.pst MS Exchange Address
Book File, Outlook Personal Folder File (Microsoft)
.reg Registration
Information/Key for W95/98, Registry Data File
.scf Windows Explorer
.scr Windows Screen
.sct Windows Script
Component, Foxpro Screen (Microsoft)
.shb Windows Shortcut
into a Document
.shs Shell Scrap Object
.ps1 Windows PowerShell
.ps1xml Windows PowerShell
.ps2 Windows PowerShell
.ps2xml Windows PowerShell
.psc1 Windows PowerShell
.psc2 Windows PowerShell
.tmp Temporary
.url Internet Location
.vb VBScript File or
Any VisualBasic Source
.vbe VBScript Encoded
Script File
.vbs VBScript Script
File, Visual Basic for Applications Script
.vsmacros Visual Studio .NET
Binary-based Macro Project (Microsoft)
.vsw Visio Workspace
File (Microsoft)
.ws Windows Script File
.wsc Windows Script
.wsf Windows Script File
.wsh Windows Script Host
Settings File
.xnk Exchange Public
Folder Shortcut
.zip Compressed archive file

In addition to the table above, file attachments are removed if the filename conains many continuous white spaces, or if the filename contains double file extenstions (for example filename.jpg.exe).