Update u_e-mailcow_ui-bl_wl.md

docs/u_e-mailcow_ui-bl_wl.md

@@ -5,3 +5,5 @@ To add or edit an entry to your **domain wide** filter table, login to your *mai
 
 !!! info
     Be aware that a user [may override](u_e-mailcow_ui-spamfilter.md) this setting by setting his own black- and whitelist!
+
+There is also a global filter table in /admin to configure a server-wide filter for multiple Regex maps (Todo: Screenshots).