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.