You can now blacklist items from the config as shown below
Code (YAML):
blacklisted-items: - 'COMMAND_BLOCK'
- 'BOW'
Blacklisted items can be removed from enderchests but not added. If persons have blacklisted items in their enderchests already, they are able to remove them but not add it again.
A message is displayed when a player tries to add a blacklisted item to their enderchest.