kumo.apply_supplemental_trace_header
Since: Version 2025.10.06-5ec871ab
The functionality described in this section requires version 2025.10.06-5ec871ab of KumoMTA, or a more recent version.
Builds a supplemental trace header according to the optional parameters, and adds it to the message.
If opt_params is omitted or is nil, then the default params will be used.
The parameters are the same as the
start_esmtp_listener.trace_headers
parameter value.
Example: add a default supplemental trace header
Both of these examples are equivalent: