This document describes the Safelist/Blocklist (SLBL) limitation and configuration of the limits for the Cisco Email Security Appliance (ESA) and Security Management Appliance (SMA).
Safelist/Blocklist limitation and configuration of limits
The size limit of the SLBL can be adjusted through the web interface of the ESA or SMA.
From the ESA: Monitor > Quarantines > End-User Safelist/Blocklist (Spam Quarantine) > Edit Settings
From the SMA: Management Appliance > Centralized Services > Spam Quarantine > End-User Safelist/Blocklist > Edit Settings
Note: Currently, the maximum limit is 500. This is the maximum number of addresses or domains for each list, for each recipient. If you allow a large number of list entries per user, system performance might be adversely affected.