append_part
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.
Appends PART, which must also be a MimePart (perhaps created via
kumo.mimpart.new_text or similar) to the set of
child parts in mimepart.
This is potentially useful when constructing complex multipart messages. You
are responsible for ensuring that the resulting mime tree makes logical sense;
mimepart should have a Content-Type that is recognized as being a multipart
container of some kind.
You might consider instead using kumo.mimepart.builder for a simpler message building experience.