Email, Spam Control, Email or attachment disappears
Emails that are sent to @illinois.edu email addresses are scanned for known viruses. If an attachment contains a virus, the email is automatically deleted. Certain file types are automatically filtered; a list of those is available at Email, Spam Control, Attachment filters . Archive file types (such as .zip) that contain more than 256 files or are more than 10 layers deep (folders within folders) are automatically filtered.
When sending email that contains an attachment to an @illinois.edu address the message disappears, but when sending to a non-University address the message is delivered.
Note: Once an attachment is stripped, it is deleted and cannot be retrieved.