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  • What file extensions are blocked and not allowed to be sent or received through email?

    2 comments March 14th, 2017 794

    The following “dangerous” file extensions are blocked and are not allowed to be sent or received through our email services.  These extensions are also blocked within zip, rar and other types of compressed archives. We disallow these extensions as they are commonly used in viruses, malware, rootkits, ransomware and other security issues. Attempting to send an email containing an attachment with a blocked extension will result in the email being rejected and sent back to you with a notice. If you are sent an email containing an attachment with a blocked extension, the email will also be rejected.

    .ade
    .adp
    .app
    .asp
    .bas
    .bat
    .cer
    .chm
    .cla
    .class
    .cmd
    .cnt
    .com
    .cpl
    .crt
    .csh
    .der
    .exe
    .fxp
    .gadget
    .grp
    .hlp
    .hpj
    .hta
    .inf
    .ins
    .isp
    .its
    .jar
    .js
    .jse
    .ksh
    .lnk
    .mad
    .maf
    .mag
    .mam
    .maq
    .mar
    .mas
    .mat
    .mau
    .mav
    .maw
    .mcf
    .mda
    .mdb
    .mde
    .mdt
    .mdw
    .mdz
    .msc
    .msh
    .msh1
    .msh2
    .mshxml
    .msh1xml
    .msh2xml
    .msi
    .msp
    .mst
    .ocx
    .ops
    .osd
    .pcd
    .pif
    .pl
    .plg
    .prf
    .prg
    .pst
    .reg
    .scf
    .scr
    .sct
    .shb
    .shs
    .ps1
    .ps1xml
    .ps2
    .ps2xml
    .psc1
    .psc2
    .tmp
    .url
    .vb
    .vbe
    .vbp
    .vbs
    .vsmacros
    .vsw
    .ws
    .wsc
    .wsf
    .wsh
    .xnk
    .xbap

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  1. Why isn’t XLSM on the list?

    Comment by Richard on March 16th, 2017 at 8:15 PM



  2. @Richard – Thank you for your feedback. The list is based on attachments that we have seen and tested over 6 months for malicious content, .xlsm files were not something we saw regularly or with any malicious content.

    Comment by Christopher York Staff Member on March 20th, 2017 at 8:15 AM



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