!=
-ERR Password
CWD etc
DEBUG
ERROR
EXPN
FAILURE
Failed
ILLEGAL
PERMITTED
REFUSED
RETR group
RETR passwd
RETR pwd.db
ROOT LOGIN
SITE EXEC
VRFY
\bBAD\b
admin 
alias database
debug
denied
deny
expn
failed
failure
illegal
kernel: Packet log: .* DENY
kernel: Packet log: .* REJECT
kernel: martian source
permitted
promisc
reject
rexec
rshd
securityalert
setsender
shutdown
smrsh
sucked
unapproved
unauthorized
violation
vrfy
