Today corporate email templates and signatures usually contain pictures - see sample email signature below:
For example here there are four different icons. These icons become unnecessary attachments on Remedyforce Incidents, Change requests and so on when using email. Unnecessary attchments makes IT staff work less efficient (tryign to find significant attachments)
Proposal is to have a "blacl list" of attached files, which are excluded by email listeners (on all objects using emails). Black listing would be implemented for pictures matching name and size of the entry on the list. Black listing would not be implemented against Chatter posts.