transform({ type => $header_name, data => $header_data })

'transform' a header from the 'raw' state (the way it was returned from the server) to an appropriate object. if no appropriate object exists the header will be decoded (using decode_mime_words()) and UTF-8 encoded

the following 'transformations' take place:

• from -> Email::Address::XS object
• to -> Email::Address::XS object
• cc -> Email::Address::XS object
• date -> CiderWebmail::Date object