[Spam Mail] What file formats can you not send through Kakao Mail?
Kakao Mail restricts certain file formats in order to prevent the spread of malicious codes and viruses.
The following file formats are restricted to protect users' device from viruses and ransom ware.
Restricted file formats are subject to change.

Restricted file formats
.img / .gadget / .grp / .hta / .cer / .xbap / .rar / .ade / .adp /.asx / .bas / .bat / .chm / .cmd / .com / .cpl / .crt / .dll / .der / .exe / .hlp / .inf / .ins / .isp / .js / .jse / .lnk / .maq / .mar / .mas / .mat / .maf / .mda / .mdb / .mde / .mdt / .mdw / .mdz / .msc / .msi / .msp / .mst / .nws / .ops / .pcd / .pif / .prf / .reg / .scf / .scr / .sct / .shb / .shs / .shm / .swf / .ocx / .url / .vb / .vbe / .vbs / .vbx / .vxd / .wsc / .wsf / .wsh / .nsh / .sys / .jar / .ace