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kumo.dns.set_mx_concurrency_limit(LIMIT)

Since: Dev Builds Only

The functionality described in this section requires a dev build of KumoMTA. You can obtain a dev build by following the instructions in the Installation section.

Set the maximum number of concurrent MX lookups that we will allow to send to the upstream DNS resolver.

The default is 128.

In earlier versions of kumomta, there was no default, issuing as many queries as we were requested to make at any given moment.

kumo.on('pre_init', function()
  kumo.dns.set_mx_concurrency_limit(128)
end)