As a security measure to prevent potential viruses, Gmail doesn't allow you to send or receive executable files (such as files ending in .exe). Executable files can contain harmful code that might cause malicious software to download to your computer. In addition, Gmail doesn't allow you to send or receive corrupted files, files that don't work properly.
File types that can't be received
We can't receive or send the following file types:
.ade, .adp, .bat, .chm, .cmd, .com, .cpl, .exe, .hta, .ins, .isp, .jse, .lib, .lnk, .mde, .msc, .msp, .mst, .pif, .scr, .sct, .shb, .sys, .vb, .vbe, .vbs, .vxd, .wsc, .wsf, .wsh
Messages containing the types of files listed above will be bounced back and returned to the sender automatically. Gmail won't accept these file types even if they're sent in a zipped format. Here are some examples of zipped formats:
.zip, .tar, .tgz, .taz, .z, .gz, .rar
Zip file within another zip file
It isn't possible to send or receive a password-protected zip file containing a zip file. Please de-compress all files or remove the password protection if possible´, if you want to send a mail.
Mac users, sending a zip file which also contrains another zip file increases your chances of file corruption. Our mail provider recommend that you decompress all files first and create only one zip file.