Message Handling Settings: Repaired Message Handling Messages are considered repaired if the message was completely scanned and all viruses have been repaired or removed. These messages will be delivered as is. Encrypted Message Handling Messages are considered encrypted if the engine is unable to finish the scan due to an encrypted or protected field in the message. Messages that are marked encrypted may also be repaired. Unscannable Message Handling Messages are considered unscannable if a scanning timeout value has been reached, or the engine becomes unavailable due to an internal error. Messages that are marked unscannable may also be repaired. Virus Infected Message Handling The system may be unable to drop the attachment or completely repair a message. In these cases, you can configure how the system handles messages that could still contain viruses. https://www.cisco.com/c/en/us/td/docs/security/esa/esa120/user_guide/b_ESA_Admin_Guide_12_0/b_ESA_Admin_Guide_chapter_01011.html#con_1132282