class type mime_header =A MIME header with both read and write method. It is still possible, however, to set the read-only flag to make this kind of header immutable, too.
Netmime.mime_header_roSupports all these read access method, too
Immutablewill be raised.
set_fields replaces the current fields with a new list of
update_field name value replaces all fields
of the passed name with the single setting (name,value), or
adds this setting to the list.
update_multiple_field name values
replaces all fields of the passed name with the list of values,
or adds this list. Finally,
delete_field name deletes all
fields of the passed name. Nothing happens if there is no such
update_multiple_field first replace
existing values by the new ones without changing the order
of the fields in the header. Additional values are inserted
after the last existing value, or at the end of the header.