Issue
Unable to Email Out some specific attachment
Symptoms
552 5.7.0 review our attachment guidelines
Cause
The attachment file type is restricted
Workaround
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 orreceive corrupted files, files that don’t work properly.
Files types that unable to Send or Receive
.ade, .adp, .bat, .chm, .cmd, .com, .cpl, .exe, .hta, .ins, .isp, .jse, .lib, .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
Additional Information
If you need further assistance, kindly submit ticket to Support Team regarding this issue.