kumomta/docs/reference/addressheader/name.md

addressheader.name

If the address header consists of a single simple address, returns the display name portion of the address. For example, if the address is "John Smith <first.last@example.com>, addressheader.name will evaluate as "John Smith".

If the address header is not a single simple address, raises an error.

If the address header is a single simple address, but has no display name, returns nil.

See also addressheader.user, addressheader.domain.