Github user Humbedooh commented on the issue:
https://github.com/apache/incubator-ponymail/issues/155
Yes, mod_lua needs to be loaded for this to work. See
http://modlua.org/gs/installing - the module should be there already (unless
you built from source), as it's a standard core module, so you should only need
to add the LoadModule directive to your configuration.
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