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It is possible to limit what users can do with Directives by setting a whitelist, perhaps just with 'priority' or even specific Alias keys that have been defined. Directives can be limited by Allowlist or Blocklist, using both is a little nonsensical, but will mean within the set of Allowlisted directives. Those that are Blocklisted are then discounted.
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Directive Groups
Directive Groups are used to define the User groups that the sender must be part of. If they do not have one of the groups defined then the matched directives will not be processed.
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Parsing and outcome for content
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