email is blocking one of the files - says can't be sent.
Attachment types that are blocked
The attachment types that are blocked by this policy include the following:
ade, adp, apk, appx, appxbundle, bat, cab, cer, chm, cmd, com, cpl, dll, dmg, exe, hlp, hta, ins, iso, isp, jar, js, jse, lib, lnk, mde, msc, msi, msix, msixbundle, msp, mst, nsh, pif, ps1, pst, reg, scr, sct, shb, sys, tmp, url, vb, vbe, vbs, vxd, wsc, wsf, wsh, terminal, cod.
Apart from the above extensions, if the file type is a executable or a script or a code file, the file cannot be sent by email.
The emails with these attachments will not be Sent/ Received via Zoho Mail and will be bounced back. This also holds true if these file types are placed in a zip file. That is, even if one file among the many in a zip archive contains any of the above mentioned file types, it will not be sent/received via Zoho Mail.
So if you try to attach any one of these file types in an email, you will receive error messages while attaching the file and the email will not be sent to your recipient(s) and will remain in your outbox.