AddressHeader object
Represents the parsed form of an email header that holds email addresses,
such as "From" and "To" headers.
As these headers can contain lists of addresses and groups of addresses, care needs to be taken when processing them.
Convenience accessors for the common case of a single address are provided, but they will raise an error when used on an address that is not a simple single address.
The addressheader.list field can be used to safely operate on the parsed out set of addresses, regardless of how many are present.
Note that you can use tostring(address) to get a JSON rendition of the parsed
address information.