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n class 
n delivery agent flag 
N line (qf file) 
N= delivery agent equate 
N= queue-group equate 
name servers  2nd 
name-server lookups 
NAMED_BIND compile-time macro 
names
    alternative for sendmail 
    canonical  2nd  3rd 
    canonicalizing  [See canonicalization]
    of classes 
    controlling terminal 
    DNS  [See DNS]
    domain  2nd 
    full sender  [See $x macro]
    host  [See hostnames]
    of macros  2nd 
    meaningful, declared for rule sets 
    symbolic, for delivery agents 
    unqualified  2nd 
    user  [See user names]
NDBM compile-time macro 
ndbm database 
NEED... compile-time macros 
Nemeth, Evi 
nested macro conditionals 
NET... compile-time macros 
netinfo database type 
network interfaces, probing 
network support 
networks 
    forwarding messages over 
NETX25 compile-time macro 
newaliases command  2nd  3rd 
NEWDB compile-time macro 
    defined automatically 
newlines  [See whitespace]
news, mailing list gateways to 
nf files 
nice, N= delivery agent and 
NIS compile-time macro 
nis database type 
NISPLUS compile-time macro 
nisplus database type 
NNTPSERVER variable 
no mailer in parsed address error message 
no_default_msa feature 
NO_GROUP_SET compile-time macro 
nobody user 
nocanonify feature 
nodns feature 
NOFTRUNCATE compile-time macro 
non-local, aliases 
NOTIFY command (SMTP) 
NOTIFY extension, DSN 
notsticky feature 
NOTUNIX compile-time macro 
nouucp feature  2nd 
nrcpts= equate (syslog output) 
nsd database database-map 
nslookup program 
ntries= equate (syslog output) 
null addresses 
null bytes, F=1 delivery agent flag and 
null database type 
nullclient feature 
numbers  [See also identifier]
    declared for rule sets 
    delivery failure count 
    inode and device 
numeric-type arguments