From a security perspective, AntCloud.net Mail Server would reject inbound mails containing attachments with any of the following file extensions:
| .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 | 
| .com | 
