It's not new behavior - it was in Netscape 4.0, for example. However, there are some clients that will give binary attachments an inline disposition (Outlook, in particular), and that tricks us into fetching the part because the sender has said to display the attachment inline.
It's not new behavior - it was in Netscape 4.0, for example. However, there are some clients that will give binary attachments an inline disposition (Outlook, in particular), and that tricks us into fetching the part because the sender has said to display the attachment inline.