Certain file types are considered potentially dangerous because they can contain executable programs or macros and therefore files with the following extensions are blocked:
ade, adp, ani, bas, bat, chm, cmd, com, cpl, crt, exe, hlp, ht, hta, inf, ins, isp, job, js, jse, lnk, mda, mdb, mde, mdz, msc, msi, msp, mst, pcd, pif, reg, scr, sct, shs, url, vb, vbe, vbs, wsc, wsf, wsh
Emails that contain files of these types will be delivered to the recipient with the offending files stripped off. A message will be appended to the bottom of the email explaining which files were stripped and why and advising the recipient to use the FSU Dropbox Utility to send these types of attachments.
We understand that not all files with these extensions are dangerous (just potentially dangerous, especially if they are from unknown or untrusted sources). So, for cases where you need to transmit files with these types or extensions, please use the FSU Dropbox Utility to send attachments that cannot be sent via email. The FSU Dropbox Utility can be found at: http://dropbox.fsu.edu/
Archive attachments (such as "tar" and "zip" type files) are not systematically blocked. However, if the archive attachment file contains a file of a prohibited type from the above list, then the entire archive file will be stripped from the email. Also, if an archive file is password protected, then the virus scanner cannot open the file to check it for viruses ,and the email is discarded and not delivered. There are several popular viruses that propagate through this method.