Many all-in-one devices can send digitised paper documents by e-mail and fax. Without special precautions, information can be deliberately or accidentally transmitted to unauthorised recipients this way. Users could, for example, enter recipient addresses or telephone numbers incorrectly. As a result, sensitive data may be unintentionally sent to the wrong recipient. In addition, attackers can use an e-mail or fax function to quickly send confidential documents to the outside world.

Many networked printers can be configured to receive print jobs from the Internet via e-mail and send scanned documents as e-mail attachments. Here, the user-defined input field for the sender's address can be misused to send e-mails under a different name to internal and external recipients.