kumo.start_esmtp_listener {PARAMS}

Configure and start ESMTP service.

This function should be called only from inside your init event handler.

To listen on multiple IP/port combinations, simply call kump.start_esmtp_listener multiple times with the appropriate parameters.

kumo.on('init', function()
  -- use the same settings for ports 25 and 2026, without repeating them all
  for _, port in ipairs { 25, 2026 } do
    kumo.start_esmtp_listener {
      listen = '0:' .. tostring(port),
      relay_hosts = { '0.0.0.0/0' },
    }
  end
end)

Note

You can also use the smtp_server_get_dynamic_parameters event to dynamically adjust listener parameters. You cannot bind new ports or IPs that way, but if you are using the "any" address such as 0.0.0.0 or ::, you can dynamically refine the parameters for IP-based virtual service.

PARAMS is a lua table that can accept the keys listed below:

• banner
• client_timeout
• data_buffer_size
• data_processing_timeout
• deferred_queue
• deferred_spool
• hostname
• invalid_line_endings
• line_length_hard_limit
• listen
• max_connections
• max_message_size
• max_messages_per_connection
• max_recipients_per_message
• meta
• peer
• relay_hosts
• tls_certificate
• tls_private_key
• trace_headers
• via