What are the allowed attachments?

Last updated on July 10, 2019

We forward emails with attachments for up to 10Mb per email (including message and attached files) and up to 25Mb for our premium members.

We refuse some attachments for security reasons. The list is basically the same as the other main email providers.

Here are the extensions that are not allowed on ImprovMX:

  • .ade
  • .adp
  • .bat
  • .chm
  • .cmd
  • .com
  • .cpl
  • .dll
  • .exe
  • .hta
  • .ins
  • .isp
  • .jar
  • .jse
  • .lib
  • .lnk
  • .mde
  • .msc
  • .msc
  • .msi
  • .msp
  • .mst
  • .nsh
  • .pif
  • .scr
  • .sct
  • .shb
  • .sys
  • .vb
  • .vbe
  • .vbs
  • .vxd
  • .wsc
  • .wsf
  • .wsh