Users need the ability to delete unsolicited PDF documents that are from unknown senders plus the ability to block the unknown sender from repeating the abuse. This is critical, especially when a document is an "invoice" asking for a signature. User should not have to contact sender. I see this system as currently allowing dangerous SPAM and becoming a target for use by unscrupulous senders. Please give users the easy ability to quickly delete these documents without acknowledging or confirming to the sender of receipt or deletion. Users need to be able to permanently block the sender and prevent further abuse of Acrobat Sign.