Any unsafe attachment like *.EXE is blocked by the mail server. Unsafe attachment even being compress/zip is blocked by the server.To send mail with this kind of attachment, the sender is suggested to rename the file extension (e.g. rename .exe to .bak). The recipients can save the file first and then change the file extension back to the original one.Blocked file extensions by our mail server includes:

  • *.vbs
  • *.doc.com
  • *.doc.bat
  • *.zip.com
  • *.zip.pif
  • *.zip.lnk
  • *.exe
  • *.com
  • *.bat
  • *.pif
  • *.scr
  • *.cmd


For detailed unsafe file list, you can refer to:Information About the Outlook E-mail Security Update (Q262631)