There are certain attachements which will be rejected for security reasons.
The following attachement types will be rejected by our mailservers:
.exe .com .bat .pif .scr .lnk
Genuine files of this nature will be accepted by the mailserver if they are compressed into an archive before sending using any file compression software like WINZIP. Please request from the sender to "zip" the files before emailing them to you.
Quite often computer viruses are sent via email in files with the above extensions.