add supplied fields to header *
adds bcc
address(es) *
adds cc
address(es) *
adds from
email destination *
adds to
address(es) *
returns any email addresses marked as bcc
*
returns any email addresses marked as cc
*
sets transfer encoding to supplied encoding *
adds supplied contenttype replacing any previously found content types *
gets any fields of type A
*
returns any email addresses marked as replyTo
*
returns any email address marked as to
*
Represents Email header that consists of arbitrary fields.
Encoding/Decoding of this header is according to specification in RFC 5322.