num_concurrent_reqs

Since: Version 2025.03.19-1d3f1f67

The functionality described in this section requires version 2025.03.19-1d3f1f67 of KumoMTA, or a more recent version.

Integer. When more than one nameserver is configured, how many of them to query in parallel for a single lookup. 0 or 1 means queries are issued serially. Defaults to 2.