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b class 
b delivery agent flag 
B line (qf file) 
backslash (\)
    in header fields 
    in rules 
bad ruleset definition error message 
base64 messages 
batching rule testing 
Bcc: header line 
Berkeley vendor specification 
bestmx database type 
bestmx_is_local feature 
BIND
    obtaining via FTP 
    resource on  2nd  [See also DNS]
bitdomain feature 
BITNET addresses 
BITNET_RELAY m4 macro 
BITNET_RELAY mc macro 
BITNET_SITECONFIG mc macro 
blacklist_recipients feature 
BlankSub option 
blind carbon copy (Bcc) 
body of message 
    B line (qf file) 
    in queue  2nd 
BODY parameter (ESMTP)  2nd 
bodytype= equate (syslog output) 
bogus qf files 
Boolean-type arguments 
bouncing messages  2nd 
    down sites and 
    from retired accounts 
    mailing lists and  2nd 
    saved in qf file 
    to postmaster  2nd 
braces { }  2nd 
BROKEN_ANSI_LIBRARY compile-time macro 
BROKEN_RES_SEARCH compile-time macro 
BSD4_3 and BSD4_4 compile-time macros 
btree database type 
buffer, tokenization and  [See workspace]
bugs  2nd 
    NIS and vfork 
Build script 
Build, top level version 
building
    alias database  2nd 
    sendmail 
bulk precedence