Attaching files to an email message is a very convenient way to distribute documents. But it may be difficult or awkward for the recipient, so please keep the following points in mind to make life easier for them. They are particularly important if you are sending to many people as when you send to a mailing list.
Viruses are commonly spread via executable files sent as attachments to emails. For this reason, the University mail system will not deliver attachments that have a certain file type, which could potentially spread a virus. If you try and send a message that includes a dangerous attachment, you will get a warning, and the attachment will not be delivered.
Examples of file types that will not be delivered include: .exe, .com, .scr (screen saver), and Access files, such as .mdb.
ZIP files are not treated as unsafe in themselves, but the list of contents will be inspected, and the ZIP file will not be accepted if any of the contained files are unsafe ones.
The simplest way to send a file of an unsafe type is to change the file extension. For example, change the name "myprog.exe" to "myprog.ex_", and tell the recipient to change it back before use.