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H configuration command 
h delivery agent flag 
H line (qf file) 
H* default for all headers 
H_... flags 
HACK m4 macro 
HAS... compile-time macros 
hash database type 
headers  2nd 
    7bit, F=6 delivery agent flag and 
    Check after all have been processed 
    checking with rule sets 
    defining, recommendations for 
    in queue 
    maximum length 
    mc configuration and 
    message
        behavior in conf.c file 
        defining  [See H configuration command]
        getting recipients from 
        in qf file 
        mailing lists and 
    reference guide to 
    screening 
        with $ 
        with H* 
Hein, Trent R. 
HELO command (SMTP)  2nd 
help documentation  [See resources for further reading]
HES_GETMAILHOST compile-time macro 
HESIOD compile-time macro 
hesiod database type 
hidden dot algorithm 
high bit 
history of sendmail 
HoldExpensive option 
holding messages 
home directory of recipients 
hop count  2nd 
hostnames 
    $@ operator and 
    canonicalizing  [See canonicalization]
    case sensitivity and 
    default 
    domain part of, $m macro for 
    fully qualified  2nd 
    short form of, $w macro for  2nd 
hosts
    canonical name of 
    IP addresses of 
    masquerading  [See masquerading]
    offsite MX 
    setting 
    smart  2nd  3rd  4th 
    sticky and nonsticky 
hoststat command 
hubs, $H macro for 
Hunt, Craig