The following file extensions are blocked for security reasons. Any emails containing one of these extensions will be rejected.
| .ade | .adp | .adt | .app | .asd | .asp | .asx | .bas |
| .bat | .bin | .btm | .cab | .cbl | .cbt | .cgi | .chm |
| .cil | .cla | .clas | .class | .cmd | .cpe | .cpl | .crt |
| .csc | .csh | .css | .cvp | .dll | .dot | .drv | .exe |
| .fon | .fxp | .hlp | .hta | .htr | .inf | .ini | .inp |
| .ins | .isp | .jar | .js | .jse | .keyreg | .ksh | .lib |
| .lnk | .mda | .mdb | .mde | .mdt | .mdw | .mht | .mhtm |
| .mhtml | .msc | .msi | .msp | .mst | .mp3 | .nte | .nws |
| .obj | .ocx | .ops | .ov | .pcd | .pgm | .pif | .pl |
| .pm | .prg | .scr | .sct | .shb | .shs | .slb | .smm |
| .swf | .swt | .sys | .vbe | .vbs | .vbx | .vir | .vmx |
| .vxd | .wmd | .wms | .wmz | .wsc | .wsf | .wsh | .xms |
