4 extern unsigned int hfield_skipname();
5 extern int hfield_known();
6 extern int hfield_valid();
19 #define H_R_REPLYTO 12
24 #define H_R_MESSAGEID 17
25 #define H_RETURNRECEIPTTO 18
27 #define H_APPARENTLYTO 20
29 #define H_RETURNPATH 22
30 #define H_DELIVEREDTO 23
31 #define H_CONTENTLENGTH 24
32 #define H_CONTENTTYPE 25
33 #define H_CONTENTTRANSFERENCODING 26
34 #define H_NOTICEREQUESTEDUPONDELIVERYTO 27
35 #define H_MAILFOLLOWUPTO 28