kumomta/sink.lua

local kumo = require 'kumo'

-- This config acts as a sink that will discard all received mail

kumo.on('init', function()
  -- Define a listener.
  -- Can be used multiple times with different parameters to
  -- define multiple listeners!
  kumo.start_esmtp_listener {
    listen = '127.0.0.1:2026',
  }

  -- Define the default "data" spool location.
  -- This is unused by this config, but we are required to
  -- define a default spool location.
  kumo.define_spool {
    name = 'data',
    path = '/tmp/kumo-sink/data',
  }

  -- Define the default "meta" spool location.
  -- This is unused by this config, but we are required to
  -- define a default spool location.
  kumo.define_spool {
    name = 'meta',
    path = '/tmp/kumo-sink/meta',
  }
end)

kumo.on('smtp_server_message_received', function(msg)
  -- Accept and discard all messages
  msg:set_meta('queue', 'null')
end)