262     max_count = None  variable in UnstructuredHeader
273     max_count = 1  variable in UniqueUnstructuredHeader
287     max_count = None  variable in DateHeader
324     max_count = 1  variable in UniqueDateHeader
329     max_count = None  variable in AddressHeader
384     max_count = 1  variable in UniqueAddressHeader
399     max_count = 1  variable in UniqueSingleAddressHeader
404     max_count = 1  variable in MIMEVersionHeader
444     max_count = 1  variable in ParameterizedMIMEHeader
506     max_count = 1  variable in ContentTransferEncodingHeader
527     max_count = 1  variable in MessageIDHeader