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Wez Furlong
e38830fc4e
Previously we'd sequentially walk through the list of domains to resolve their MX records. This can be slow, especially in the context of `kumod --validate` or when running `validate-shaping` standalone where we start with empty MX caches. This commit runs the lookups in parallel, with up to 128 concurrent lookups taking place at once, so that we can get through a large shaping configuration in much less time.