267     max_count = None  variable in UnstructuredHeader
278     max_count = 1  variable in UniqueUnstructuredHeader
292     max_count = None  variable in DateHeader
322     max_count = 1  variable in UniqueDateHeader
327     max_count = None  variable in AddressHeader
382     max_count = 1  variable in UniqueAddressHeader
397     max_count = 1  variable in UniqueSingleAddressHeader
402     max_count = 1  variable in MIMEVersionHeader
442     max_count = 1  variable in ParameterizedMIMEHeader
504     max_count = 1  variable in ContentTransferEncodingHeader
525     max_count = 1  variable in MessageIDHeader