Information Technology Self Help

List of file attachments types that are blocked by the incoming/outgoing mail server.

Files with the following extensions will be stripped from attachments by the email server.

Note: This applies to IMAP/POP/Squirrelmail Accounts. Also, this applies for Exchange users sending email to addresses external to Exchange.

Extension Reason
.reg Windows registry entries are very dangerous in email
.chm Compiled help files are very dangerous in email
.cnf SpeedDials are very dangerous in email
.hta HTML archives are very dangerous in email
.ins Windows Internet Settings are dangerous in email
.jse? JScript Scripts are dangerous in email
.lnk Eudora *.lnk security hole attack
.ma? Microsoft Access Shortcuts are dangerous in email
.pif Shortcuts to MS-Dos programs are very dangerous in email
.scf Windows Explorer Commands are dangerous in email
.sct Windows Script Components are dangerous in email
.shb Shortcuts Into Documents are very dangerous in email
.shs Shell Scrap Objects are very dangerous in email
.vbe,.vbs Visual Basic Scripts are dangerous in email
.ws Windows Script Host files are dangerous in email
.xnk Microsoft Exchange Shortcuts are dangerous in email
.com Executable DOS/Windows programs are dangerous in email
.exe Executable DOS/Windows programs are dangerous in email
.scr Windows Screensavers are often used to hide viruses
.bat Batch files are often malicious
.cmd Batch files are often malicious
.cpl Control panel items are often used to hide viruses
.mhtml MHTML files can be used in an attack against Eudora
.??_ Not Available
.001 Not Available
.002 Not Available
.3gr Not Available
.acm Not Available
.adt Not Available
.app Not Available
.asd Not Available
.ax? Not Available
.bo? Not Available
.cab Not Available
.cbt Not Available
.cla Not Available
.cpt Not Available
.csc Not Available
.d?b Not Available
.dev Not Available
.dif Not Available
.dl? Not Available
.drv Not Available
.fo? Not Available
.gms Not Available
.gz? Not Available
.ice Not Available
.im? Not Available
.js? Not Available
.mb? Not Available
.mpd Not Available
.mrc Not Available
.ms? Not Available
.mso Not Available
.obd Not Available
.obj Not Available
.obt Not Available
.ocx Not Available
.olb Not Available
.ole Not Available
.otm Not Available
.ov? Not Available
.pci Not Available
.pdb Not Available
.pdr Not Available
.prc Not Available
.qlb Not Available
.qpw Not Available
.shb Not Available
.sis Not Available
.smm Not Available
.sys Not Available
.td0 Not Available
.tlb Not Available
.tsp Not Available
.vbx Not Available
.vwp Not Available
.vxd Not Available
.wbk Not Available
.wiz Not Available
.ws? Not Available
.xlb Not Available
.xsl Not Available
.xtp Not Available

Last Update: 2009-04-24 11:51 AM