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

    2 comments March 14th, 2017 32

    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.

    AD
    ADE
    ADP
    APP
    APPLICATION
    ASD
    ASF
    ASP
    BAS
    BAT
    BIN
    CAB
    CEO
    CER
    CHM
    CHT
    CMD
    COM
    CPL
    CRT
    CSH
    DOCM
    DOTM
    DLL
    EXE
    FXP
    GADGET
    GZ
    HLP
    HTA
    HTO
    INF
    INS
    ISP
    ITS
    JAR
    JS
    JSC
    JSE
    KSH
    LIB
    LNK
    NSH
    MAD
    MAF
    MAG
    MAM
    MAQ
    MAR
    MAS
    MAT
    MAU
    MAV
    MAW
    MDA
    MDB
    MDE
    MDT
    MDW
    MDZ
    MSC
    MSI
    MSP
    MST
    NWS
    OCX
    OPS
    PCD
    PI
    PIF
    PPTM
    POTM
    PPAM
    PPSM
    PRF
    PRG
    PST
    PS1
    PS1XML
    PS2
    PS2XML
    PSC1
    PSC2
    REG
    SCF
    SCR
    SCT
    SEA
    SHB
    SHM
    SHS
    SLDM
    SYS
    TAZ
    TGZ
    TMP
    TZ
    UUE
    VB
    VBE
    VBS
    VBX
    VSD
    VSMACROS
    VSS
    VST
    VSW
    VXD
    WS
    WSC
    WSF
    WSH
    XLSM
    XLTM
    XLAM
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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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