a2p
accept
access
acct
addftinfo
addr2line
adjtime
afmtodit
after
aio_cancel
aio_error
aio_read
aio_return
aio_suspend
aio_waitcomplete
aio_write
alias
aliases
alloc
anvil
append
apply
apropos
ar
array
as
asa
asn1parse
at
atq
atrm
attemptckalloc
attemptckrealloc
authlib
authtest
autopoint
awk
b64decode
b64encode
basename
batch
bc
bdes
bell
bg
bgerror
biff
big5
binary
bind
bindkey
bindtags
bindtextdomain
bio
bitmap
blowfish
bn
bootparams
bootptab
bounce
brandelf
break
breaksw
brk
bsdiff
bsdtar
bsnmpd
bspatch
bthost
btsockstat
buffer
builtin
builtins
bunzip2
button
byacc
bzcat
bzegrep
bzfgrep
bzgrep
bzip2
c2ph
c89
c99
ca
cal
calendar
canvas
cap_mkdb
case
cat
catch
catman
cc
cd
cdcontrol
chdir
checkbutton
checknr
chflags
chfn
chgrp
chio
chkey
chmod
chown
chpass
chroot
chsh
ci
ciphers
ckalloc
ckdist
ckfree
ckrealloc
cksum
cleanup
clear
clipboard
clock
clock_getres
clock_gettime
clock_settime
close
cmp
co
col
colcrt
colldef
colors
colrm
column
comm
command
compile_et
complete
compress
concat
config
connect
console
continue
core
courierlogger
couriertcpd
cp
cpan
cpio
cpp
creat
crl
crontab
crunchgen
crunchide
crypt
crypto
csh
csplit
ctags
ctm
ctm_dequeue
ctm_rmail
ctm_smail
cu
cursor
cursors
cut
cvs
date
dbiprof
dbiproxy
dc
dcgettext
dcngettext
dd
dde
default
defer
deliverquota
des
destroy
devfs
df
dgettext
dgst
dh
dhparam
dialog
diff
diff3
dig
dir
dirent
dirname
dirs
discard
disktab
dngettext
do
domainname
done
dprofpp
dsa
dsaparam
dtmfdecode
du
dup
dup2
eaccess
ec
ecdsa
echo
echotc
ecparam
ed
edit
editrc
ee
egrep
elf
elfdump
elif
else
enc
enc2xs
encoding
end
endif
endsw
engine
enigma
entry
env
envsubst
eof
eqn
err
errno
error
errstr
esac
ethers
euc
eui64
eval
event
evp
ex
exec
execve
exit
expand
export
exports
expr
extattr
extattr_delete_fd
extattr_delete_file
extattr_get_fd
extattr_get_file
extattr_set_fd
extattr_set_file
f77
false
famm
famx
fblocked
fbtab
fc
fchdir
fchflags
fchmod
fchown
fcntl
fconfigure
fcopy
fdescfs
fdformat
fdread
fdwrite
fetch
fg
fgrep
fhopen
fhstat
fhstatfs
fi
file
file2c
fileevent
filename
filetest
find
find2perl
finger
flex
flock
flush
fmt
focus
fold
font
fontedit
for
foreach
fork
format
forward
fpathconf
frame
from
fs
fstab
fstat
fstatfs
fsync
ftp
ftpchroot
ftpusers
ftruncate
futimes
g711conv
gb2312
gb18030
gbk
gcc
gcore
gcov
gdb
gencat
gendsa
genrsa
gensnmptree
getconf
getdents
getdirentries
getdtablesize
getegid
geteuid
getfacl
getfh
getfsstat
getgid
getgroups
getitimer
getlogin
getopt
getopts
getpeername
getpgid
getpgrp
getpid
getppid
getpriority
getresgid
getresuid
getrlimit
getrusage
gets
getsid
getsockname
getsockopt
gettext
gettextize
gettimeofday
gettytab
getuid
glob
global
gmake
goto
gperf
gprof
grab
grep
grid
grn
grodvi
groff
groff_font
groff_out
groff_tmac
grog
grolbp
grolj4
grops
grotty
group
groups
gunzip
gzcat
gzexe
gzip
h2ph
h2xs
hash
hashstat
hd
head
help2man
hesinfo
hexdump
history
host
hostname
hosts
hosts_access
hosts_options
hpftodit
http
hup
i386_get_ioperm
i386_get_ldt
i386_set_ioperm
i386_set_ldt
i386_vm86
iconv
id
ident
idprio
if
ifnames253
ifnames259
image
imapd
incr
indent
indxbib
info
infokey
inode
install
instmodsh
interp
intro
introduction
ioctl
ipcrm
ipcs
ipf
ipftest
ipnat
ippool
ipresend
issetugid
jail
jail_attach
jobid
jobs
join
jot
kbdcontrol
kbdmap
kcon
kdestroy
kdump
kenv
kevent
keycap
keylogin
keylogout
keymap
keysyms
kgdb
kill
killall
killpg
kinit
kldfind
kldfirstmod
kldload
kldnext
kldstat
kldsym
kldunload
klist
kpasswd
kqueue
kse
kse_create
kse_exit
kse_release
kse_switchin
kse_thr_interrupt
kse_wakeup
ktrace
label
labelframe
lam
lappend
last
lastcomm
lastlog
lchflags
lchmod
lchown
ld
ldap
ldapadd
ldapcompare
ldapdelete
ldapmodify
ldapmodrdn
ldappasswd
ldapsearch
ldapwhoami
ldd
leave
less
lesskey
lex
lgetfh
lhash
libnetcfg
library
limit
limits
lindex
link
linprocfs
linsert
lint
lio_listio
list
listbox
listen
lj4_font
lkbib
llength
lmtp
ln
load
loadfont
local
locale
locate
lock
lockf
log
logger
login
logins
logname
logout
look
lookbib
lorder
lower
lp
lpq
lpr
lprm
lptest
lrange
lreplace
ls
lsearch
lseek
lset
lsort
lstat
lsvfs
lutimes
lynx
m4
madvise
magic
mail
maildiracl
maildirkw
maildirmake
mailq
mailx
make
makeinfo
makewhatis
man
manpath
master
mc
mcedit
mcview
md2
md4
md5
mdc2
memory
menu
menubar
menubutton
merge
mesg
message
mincore
minherit
minigzip
mkdep
mkdir
mkfifo
mkimapdcert
mklocale
mknod
mkpop3dcert
mkstr
mktemp
mlock
mlockall
mmap
mmroff
modfind
modfnext
modnext
modstat
moduli
more
motd
mount
mprotect
mptable
msdos
msdosfs
msgattrib
msgcat
msgcmp
msgcomm
msgconv
msgen
msgexec
msgfilter
msgfmt
msggrep
msginit
msgmerge
msgs
msgunfmt
msguniq
mskanji
msql2mysql
msync
mt
munlock
munlockall
munmap
mv
myisamchk
myisamlog
myisampack
mysql
mysqlaccess
mysqladmin
mysqlbinlog
mysqlcheck
mysqld
mysqldump
mysqld_multi
mysqld_safe
mysqlhotcopy
mysqlimport
mysqlshow
mysql_config
mysql_fix_privilege_tables
mysql_zap
namespace
nanosleep
nawk
nc
ncal
ncplist
ncplogin
ncplogout
neqn
netconfig
netgroup
netid
netstat
networks
newaliases
newgrp
nex
nfsstat
nfssvc
ngettext
nice
nl
nm
nmount
nohup
nologin
notify
nroff
nseq
nslookup
ntp_adjtime
ntp_gettime
nvi
nview
objcopy
objdump
objformat
ocsp
od
onintr
open
openssl
opieaccess
opieinfo
opiekey
opiekeys
opiepasswd
option
options
oqmgr
pack
package
packagens
pagesize
palette
pam_auth
panedwindow
parray
passwd
paste
patch
pathchk
pathconf
pawd
pax
pbm
pcre
pcreapi
pcrebuild
pcrecallout
pcrecompat
pcrecpp
pcregrep
pcrematching
pcrepartial
pcrepattern
pcreperform
pcreposix
pcreprecompile
pcresample
pcretest
perl
perl56delta
perl58delta
perl561delta
perl570delta
perl571delta
perl572delta
perl573delta
perl581delta
perl582delta
perl583delta
perl584delta
perl585delta
perl586delta
perl587delta
perl588delta
perl5004delta
perl5005delta
perlaix
perlamiga
perlapi
perlapio
perlapollo
perlartistic
perlbeos
perlbook
perlboot
perlbot
perlbs2000
perlbug
perlcall
perlcc
perlce
perlcheat
perlclib
perlcn
perlcompile
perlcygwin
perldata
perldbmfilter
perldebguts
perldebtut
perldebug
perldelta
perldgux
perldiag
perldoc
perldos
perldsc
perlebcdic
perlembed
perlepoc
perlfaq
perlfaq1
perlfaq2
perlfaq3
perlfaq4
perlfaq5
perlfaq6
perlfaq7
perlfaq8
perlfaq9
perlfilter
perlfork
perlform
perlfreebsd
perlfunc
perlglossary
perlgpl
perlguts
perlhack
perlhist
perlhpux
perlhurd
perlintern
perlintro
perliol
perlipc
perlirix
perlivp
perljp
perlko
perllexwarn
perllinux
perllocale
perllol
perlmachten
perlmacos
perlmacosx
perlmint
perlmod
perlmodinstall
perlmodlib
perlmodstyle
perlmpeix
perlnetware
perlnewmod
perlnumber
perlobj
perlop
perlopenbsd
perlopentut
perlos2
perlos390
perlos400
perlothrtut
perlpacktut
perlplan9
perlpod
perlpodspec
perlport
perlqnx
perlre
perlref
perlreftut
perlrequick
perlreref
perlretut
perlrun
perlsec
perlsolaris
perlstyle
perlsub
perlsyn
perlthrtut
perltie
perltoc
perltodo
perltooc
perltoot
perltrap
perltru64
perltw
perlunicode
perluniintro
perlutil
perluts
perlvar
perlvmesa
perlvms
perlvos
perlwin32
perlxs
perlxstut
perror
pfbtops
pftp
pgrep
phones
photo
pic
pickup
piconv
pid
pipe
pkcs7
pkcs8
pkcs12
pkg_add
pkg_check
pkg_create
pkg_delete
pkg_info
pkg_sign
pkg_version
pkill
pl2pm
place
pod2html
pod2latex
pod2man
pod2text
pod2usage
podchecker
podselect
poll
popd
popup
posix_madvise
postalias
postcat
postconf
postdrop
postfix
postkick
postlock
postlog
postmap
postqueue
postsuper
pr
pread
preadv
printcap
printenv
printf
proc
procfs
profil
protocols
prove
proxymap
ps
psed
psroff
pstruct
ptrace
publickey
pushd
puts
pwd
pwrite
pwritev
qmgr
qmqpd
quota
quotactl
radiobutton
raise
rand
ranlib
rcp
rcs
rcsclean
rcsdiff
rcsfile
rcsfreeze
rcsintro
rcsmerge
read
readelf
readlink
readonly
readv
realpath
reboot
recv
recvfrom
recvmsg
red
ree
refer
regexp
registry
regsub
rehash
remote
rename
repeat
replace
req
reset
resolver
resource
return
rev
revoke
rfcomm_sppd
rfork
rhosts
ripemd
ripemd160
rlog
rlogin
rm
rmd160
rmdir
rpc
rpcgen
rs
rsa
rsautl
rsh
rtld
rtprio
rup
ruptime
rusers
rwall
rwho
s2p
safe
sasl
sasldblistusers2
saslpasswd2
sbrk
scache
scale
scan
sched
sched_getparam
sched_getscheduler
sched_get_priority_max
sched_get_priority_min
sched_rr_get_interval
sched_setparam
sched_setscheduler
sched_yield
scon
scp
script
scrollbar
sdiff
sed
seek
select
selection
semctl
semget
semop
send
sendbug
sendfile
sendmail
sendmsg
sendto
services
sess_id
set
setegid
setenv
seteuid
setfacl
setgid
setgroups
setitimer
setlogin
setpgid
setpgrp
setpriority
setregid
setresgid
setresuid
setreuid
setrlimit
setsid
setsockopt
settc
settimeofday
setty
setuid
setvar
sftp
sh
sha
sha1
sha256
shar
shells
shift
shmat
shmctl
shmdt
shmget
showq
shutdown
sigaction
sigaltstack
sigblock
sigmask
sigpause
sigpending
sigprocmask
sigreturn
sigsetmask
sigstack
sigsuspend
sigvec
sigwait
size
slapadd
slapcat
slapd
slapdn
slapindex
slappasswd
slaptest
sleep
slogin
slurpd
smbutil
smime
smtp
smtpd
socket
socketpair
sockstat
soelim
sort
source
spawn
speed
spinbox
spkac
splain
split
squid
squid_ldap_auth
squid_ldap_group
squid_unix_group
sscop
ssh
sshd_config
ssh_config
stab
startslip
stat
statfs
stop
string
strings
strip
stty
su
subst
sum
suspend
swapoff
swapon
switch
symlink
sync
sysarch
syscall
sysconftool
sysconftoolcheck
systat
s_client
s_server
s_time
tabs
tail
talk
tar
tbl
tclsh
tcltest
tclvars
tcopy
tcpdump
tcpslice
tcsh
tee
tell
telltc
telnet
term
termcap
terminfo
test
texindex
texinfo
text
textdomain
tfmtodit
tftp
then
threads
time
tip
tk
tkerror
tkvars
tkwait
tlsmgr
tmac
top
toplevel
touch
tput
tr
trace
trafshow
trap
troff
true
truncate
truss
tset
tsort
tty
ttys
type
tzfile
ui
ul
ulimit
umask
unalias
uname
uncomplete
uncompress
undelete
unexpand
unhash
unifdef
unifdefall
uniq
units
unknown
unlimit
unlink
unmount
unset
unsetenv
until
unvis
update
uplevel
uptime
upvar
usbhidaction
usbhidctl
users
utf8
utimes
utmp
utrace
uudecode
uuencode
uuidgen
vacation
variable
verify
version
vfork
vgrind
vgrindefs
vi
vidcontrol
vidfont
view
virtual
vis
vt220keys
vwait
w
wait
wait3
wait4
waitpid
wall
wc
wget
what
whatis
where
whereis
which
while
who
whoami
whois
window
winfo
wish
wm
write
writev
wtmp
x509
xargs
xgettext
xmlwf
xstr
xsubpp
yacc
yes
ypcat
ypchfn
ypchpass
ypchsh
ypmatch
yppasswd
ypwhich
yyfix
zcat
zcmp
zdiff
zegrep
zfgrep
zforce
zgrep
zmore
znew
_exit
__syscall
 
FreeBSD/Linux/UNIX General Commands Manual
Hypertext Man Pages
smtp
 
SMTP(8) 							       SMTP(8)



NAME
       smtp - Postfix SMTP client

SYNOPSIS
       smtp [generic Postfix daemon options]

DESCRIPTION
       The  Postfix  SMTP  client processes message delivery requests from the
       queue manager. Each request specifies a queue file, a sender address, a
       domain  or host to deliver to, and recipient information.  This program
       expects to be run from the master(8) process manager.

       The SMTP client updates the queue file and  marks  recipients  as  fin-
       ished,  or  it  informs the queue manager that delivery should be tried
       again at a  later  time.  Delivery  status  reports  are  sent  to  the
       bounce(8), defer(8) or trace(8) daemon as appropriate.

       The  SMTP  client  looks  up a list of mail exchanger addresses for the
       destination host, sorts the list by preference, and  connects  to  each
       listed address until it finds a server that responds.

       When  a	server	is not reachable, or when mail delivery fails due to a
       recoverable error condition, the SMTP client will try  to  deliver  the
       mail to an alternate host.

       After  a  successful mail transaction, a connection may be saved to the
       scache(8) connection cache server, so that it may be used by  any  SMTP
       client for a subsequent transaction.

       By  default, connection caching is enabled temporarily for destinations
       that have a high volume of mail in the active  queue.  Session  caching
       can be enabled permanently for specific destinations.

SECURITY
       The  SMTP  client  is  moderately  security-sensitive. It talks to SMTP
       servers and to DNS servers on the network. The SMTP client can  be  run
       chrooted at fixed low privilege.

STANDARDS
       RFC 821 (SMTP protocol)
       RFC 822 (ARPA Internet Text Messages)
       RFC 1651 (SMTP service extensions)
       RFC 1652 (8bit-MIME transport)
       RFC 1870 (Message Size Declaration)
       RFC 2045 (MIME: Format of Internet Message Bodies)
       RFC 2046 (MIME: Media Types)
       RFC 2554 (AUTH command)
       RFC 2821 (SMTP protocol)
       RFC 2920 (SMTP Pipelining)
       RFC 3207 (STARTTLS command)

DIAGNOSTICS
       Problems  and transactions are logged to syslogd(8).  Corrupted message
       files are marked so that the queue manager can move them to the corrupt
       queue for further inspection.

       Depending  on the setting of the notify_classes parameter, the postmas-
       ter is notified of bounces, protocol problems, and of other trouble.

BUGS
       SMTP connection caching does not work with TLS. The  necessary  support
       for  TLS  object  passivation  and re-activation does not exist without
       closing the session, which defeats the purpose.

       SMTP connection caching assumes that SASL credentials are valid for all
       destinations that map onto the same IP address and TCP port.

CONFIGURATION PARAMETERS
       Changes	to  main.cf  are picked up automatically, as smtp(8) processes
       run for only a limited amount of time. Use the command "postfix reload"
       to speed up a change.

       The  text  below provides only a parameter summary. See postconf(5) for
       more details including examples.

COMPATIBILITY CONTROLS
       ignore_mx_lookup_error (no)
	      Ignore DNS MX lookups that produce no response.

       smtp_always_send_ehlo (yes)
	      Always send EHLO at the start of an SMTP session.

       smtp_never_send_ehlo (no)
	      Never send EHLO at the start of an SMTP session.

       smtp_cname_overrides_servername (yes)
	      Allow DNS CNAME records to  override  the  servername  that  the
	      Postfix  SMTP client uses for logging, SASL password lookup, TLS
	      policy decisions, or TLS certificate verification.

       smtp_defer_if_no_mx_address_found (no)
	      Defer mail delivery when no MX record resolves to an IP address.

       smtp_line_length_limit (990)
	      The maximal length of message header and body lines that Postfix
	      will send via SMTP.

       smtp_pix_workaround_delay_time (10s)
	      How  long  the  Postfix  SMTP  client  pauses   before   sending
	      "."   in	 order	 to   work  around  the  PIX  firewall
	      "." bug.

       smtp_pix_workaround_threshold_time (500s)
	      How long a message  must	be  queued  before  the  PIX  firewall
	      "." bug workaround is turned on.

       smtp_quote_rfc821_envelope (yes)
	      Quote  addresses	in  SMTP  MAIL	FROM  and  RCPT TO commands as
	      required by RFC 821.

       smtp_skip_5xx_greeting (yes)
	      Skip SMTP servers that greet with a 5XX status code (go away, do
	      not try again later).

       smtp_skip_quit_response (yes)
	      Do not wait for the response to the SMTP QUIT command.

       Available in Postfix version 2.0 and earlier:

       smtp_skip_4xx_greeting (yes)
	      Skip  SMTP  servers  that greet with a 4XX status code (go away,
	      try again later).

       Available in Postfix version 2.2 and later:

       smtp_discard_ehlo_keyword_address_maps (empty)
	      Lookup tables, indexed by the remote SMTP server	address,  with
	      case  insensitive  lists of EHLO keywords (pipelining, starttls,
	      auth, etc.) that	the  SMTP  client  will  ignore  in  the  EHLO
	      response from a remote SMTP server.

       smtp_discard_ehlo_keywords (empty)
	      A  case insensitive list of EHLO keywords (pipelining, starttls,
	      auth, etc.) that	the  SMTP  client  will  ignore  in  the  EHLO
	      response from a remote SMTP server.

       smtp_generic_maps (empty)
	      Optional	lookup	tables	that  perform address rewriting in the
	      SMTP client, typically to transform a locally valid address into
	      a  globally valid address when sending mail across the Internet.

MIME PROCESSING CONTROLS
       Available in Postfix version 2.0 and later:

       disable_mime_output_conversion (no)
	      Disable the conversion of 8BITMIME format to 7BIT format.

       mime_boundary_length_limit (2048)
	      The maximal length of MIME multipart boundary strings.

       mime_nesting_limit (100)
	      The maximal recursion level that the MIME processor will handle.

EXTERNAL CONTENT INSPECTION CONTROLS
       Available in Postfix version 2.1 and later:

       smtp_send_xforward_command (no)
	      Send  the  non-standard  XFORWARD  command when the Postfix SMTP
	      server EHLO response announces XFORWARD support.

SASL AUTHENTICATION CONTROLS
       smtp_sasl_auth_enable (no)
	      Enable SASL authentication in the Postfix SMTP client.

       smtp_sasl_password_maps (empty)
	      Optional SMTP client lookup tables  with	one  username:password
	      entry per remote hostname or domain.

       smtp_sasl_security_options (noplaintext, noanonymous)
	      What  authentication  mechanisms	the  Postfix  SMTP  client  is
	      allowed to use.

       Available in Postfix version 2.2 and later:

       smtp_sasl_mechanism_filter (empty)
	      If non-empty, a Postfix SMTP client filter for the  remote  SMTP
	      server's list of offered SASL mechanisms.

STARTTLS SUPPORT CONTROLS
       Detailed  information  about STARTTLS configuration may be found in the
       TLS_README document.

       smtp_use_tls (no)
	      Opportunistic mode: use TLS when a remote SMTP server  announces
	      STARTTLS support, otherwise send the mail in the clear.

       smtp_enforce_tls (no)
	      Enforcement  mode:  require  that  remote  SMTP  servers use TLS
	      encryption, and never send mail in the clear.

       smtp_sasl_tls_security_options ($smtp_sasl_security_options)
	      The SASL authentication security options that the  Postfix  SMTP
	      client uses for TLS encrypted SMTP sessions.

       smtp_starttls_timeout (300s)
	      Time  limit  for	Postfix  SMTP client write and read operations
	      during TLS startup and shutdown handshake procedures.

       smtp_tls_CAfile (empty)
	      The file with the certificate  of  the  certification  authority
	      (CA) that issued the Postfix SMTP client certificate.

       smtp_tls_CApath (empty)
	      Directory  with  PEM  format  certificate authority certificates
	      that the Postfix SMTP client uses to verify a remote SMTP server
	      certificate.

       smtp_tls_cert_file (empty)
	      File with the Postfix SMTP client RSA certificate in PEM format.

       smtp_tls_cipherlist (empty)
	      Controls the Postfix SMTP client TLS cipher selection scheme.

       smtp_tls_dcert_file (empty)
	      File with the Postfix SMTP client DSA certificate in PEM format.

       smtp_tls_dkey_file ($smtp_tls_dcert_file)
	      File with the Postfix SMTP client DSA private key in PEM format.

       smtp_tls_enforce_peername (yes)
	      When TLS encryption is enforced, require that  the  remote  SMTP
	      server  hostname	matches  the  information  in  the remote SMTP
	      server certificate.

       smtp_tls_key_file ($smtp_tls_cert_file)
	      File with the Postfix SMTP client RSA private key in PEM format.

       smtp_tls_loglevel (0)
	      Enable additional Postfix SMTP client logging of TLS activity.

       smtp_tls_note_starttls_offer (no)
	      Log  the	hostname of a remote SMTP server that offers STARTTLS,
	      when TLS is not already enabled for that server.

       smtp_tls_per_site (empty)
	      Optional lookup tables with the Postfix SMTP  client  TLS  usage
	      policy  by  next-hop domain name and by remote SMTP server host-
	      name.

       smtp_tls_scert_verifydepth (5)
	      The verification depth for remote SMTP server certificates.

       smtp_tls_session_cache_database (empty)
	      Name of the file containing the optional Postfix SMTP client TLS
	      session cache.

       smtp_tls_session_cache_timeout (3600s)
	      The  expiration  time  of  Postfix SMTP client TLS session cache
	      information.

       tls_daemon_random_bytes (32)
	      The number of pseudo-random bytes that an  smtp(8)  or  smtpd(8)
	      process  requests from the tlsmgr(8) server in order to seed its
	      internal pseudo random number generator (PRNG).

RESOURCE AND RATE CONTROLS
       smtp_destination_concurrency_limit	 ($default_destination_concur-
       rency_limit)
	      The maximal number of parallel deliveries to the	same  destina-
	      tion via the smtp message delivery transport.

       smtp_destination_recipient_limit ($default_destination_recipient_limit)
	      The  maximal number of recipients per delivery via the smtp mes-
	      sage delivery transport.

       smtp_connect_timeout (30s)
	      The SMTP client time limit for completing a TCP  connection,  or
	      zero (use the operating system built-in time limit).

       smtp_helo_timeout (300s)
	      The SMTP client time limit for sending the HELO or EHLO command,
	      and for receiving the initial server response.

       smtp_xforward_timeout (300s)
	      The SMTP client time limit for sending the XFORWARD command, and
	      for receiving the server response.

       smtp_mail_timeout (300s)
	      The  SMTP  client  time limit for sending the MAIL FROM command,
	      and for receiving the server response.

       smtp_rcpt_timeout (300s)
	      The SMTP client time limit for sending the SMTP RCPT TO command,
	      and for receiving the server response.

       smtp_data_init_timeout (120s)
	      The  SMTP  client  time limit for sending the SMTP DATA command,
	      and for receiving the server response.

       smtp_data_xfer_timeout (180s)
	      The SMTP client time limit for sending the SMTP message content.

       smtp_data_done_timeout (600s)
	      The  SMTP  client  time  limit for sending the SMTP ".", and for
	      receiving the server response.

       smtp_quit_timeout (300s)
	      The SMTP client time limit for sending the QUIT command, and for
	      receiving the server response.

       Available in Postfix version 2.1 and later:

       smtp_mx_address_limit (0)
	      The  maximal number of MX (mail exchanger) IP addresses that can
	      result from mail exchanger lookups, or zero (no limit).

       smtp_mx_session_limit (2)
	      The maximal number of SMTP sessions per delivery request	before
	      giving  up  or delivering to a fall-back relay host, or zero (no
	      limit).

       smtp_rset_timeout (20s)
	      The SMTP client time limit for sending the RSET command, and for
	      receiving the server response.

       Available in Postfix version 2.2 and later:

       smtp_connection_cache_destinations (empty)
	      Permanently  enable  SMTP  connection  caching for the specified
	      destinations.

       smtp_connection_cache_on_demand (yes)
	      Temporarily enable SMTP connection caching while	a  destination
	      has a high volume of mail in the active queue.

       smtp_connection_cache_reuse_limit (10)
	      When  SMTP  connection  caching  is enabled, the number of times
	      that an SMTP session is reused before it is closed.

       smtp_connection_cache_time_limit (2s)
	      When SMTP connection caching is enabled, the amount of time that
	      an unused SMTP client socket is kept open before it is closed.

TROUBLE SHOOTING CONTROLS
       debug_peer_level (2)
	      The  increment  in verbose logging level when a remote client or
	      server matches a pattern in the debug_peer_list parameter.

       debug_peer_list (empty)
	      Optional list of remote client or  server  hostname  or  network
	      address  patterns  that  cause  the  verbose  logging  level  to
	      increase by the amount specified in $debug_peer_level.

       error_notice_recipient (postmaster)
	      The recipient of postmaster notifications  about	mail  delivery
	      problems that are caused by policy, resource, software or proto-
	      col errors.

       notify_classes (resource, software)
	      The list of error classes that are reported to the postmaster.

MISCELLANEOUS CONTROLS
       best_mx_transport (empty)
	      Where the Postfix  SMTP  client  should  deliver	mail  when  it
	      detects a "mail loops back to myself" error condition.

       config_directory (see 'postconf -d' output)
	      The  default  location of the Postfix main.cf and master.cf con-
	      figuration files.

       daemon_timeout (18000s)
	      How much time a Postfix daemon process  may  take  to  handle  a
	      request before it is terminated by a built-in watchdog timer.

       disable_dns_lookups (no)
	      Disable DNS lookups in the Postfix SMTP and LMTP clients.

       fallback_relay (empty)
	      Optional list of relay hosts for SMTP destinations that can't be
	      found or that are unreachable.

       inet_interfaces (all)
	      The network interface addresses that this mail  system  receives
	      mail on.

       inet_protocols (ipv4)
	      The  Internet  protocols Postfix will attempt to use when making
	      or accepting connections.

       ipc_timeout (3600s)
	      The time limit for sending  or  receiving  information  over  an
	      internal communication channel.

       max_idle (100s)
	      The  maximum  amount of time that an idle Postfix daemon process
	      waits for the next service request before exiting.

       max_use (100)
	      The maximal number of connection requests before a Postfix  dae-
	      mon process terminates.

       process_id (read-only)
	      The process ID of a Postfix command or daemon process.

       process_name (read-only)
	      The process name of a Postfix command or daemon process.

       proxy_interfaces (empty)
	      The  network  interface addresses that this mail system receives
	      mail on by way of a proxy or network address translation unit.

       smtp_bind_address (empty)
	      An optional numerical  network  address  that  the  SMTP	client
	      should bind to when making an IPv4 connection.

       smtp_bind_address6 (empty)
	      An  optional  numerical  network	address  that  the SMTP client
	      should bind to when making an IPv6 connection.

       smtp_helo_name ($myhostname)
	      The hostname to send in the SMTP EHLO or HELO command.

       smtp_host_lookup (dns)
	      What mechanisms when the SMTP client uses to look up a host's IP
	      address.

       smtp_randomize_addresses (yes)
	      Randomize the order of equal-preference MX host addresses.

       syslog_facility (mail)
	      The syslog facility of Postfix logging.

       syslog_name (postfix)
	      The  mail  system  name that is prepended to the process name in
	      syslog records, so that "smtpd"  becomes,  for  example,	"post-
	      fix/smtpd".

SEE ALSO
       qmgr(8), queue manager
       bounce(8), delivery status reports
       scache(8), connection cache server
       postconf(5), configuration parameters
       master(5), generic daemon options
       master(8), process manager
       tlsmgr(8), TLS session and PRNG management
       syslogd(8), system logging

README FILES
       Use  "postconf readme_directory" or "postconf html_directory" to locate
       this information.
       SASL_README, Postfix SASL howto
       TLS_README, Postfix STARTTLS howto

LICENSE
       The Secure Mailer license must be distributed with this software.

AUTHOR(S)
       Wietse Venema
       IBM T.J. Watson Research
       P.O. Box 704
       Yorktown Heights, NY 10598, USA

       Command pipelining in cooperation with:
       Jon Ribbens
       Oaktree Internet Solutions Ltd.,
       Internet House,
       Canal Basin,
       Coventry,
       CV1 4LY, United Kingdom.

       Connection caching in cooperation with:
       Victor Duchovni
       Morgan Stanley

       TLS support originally by:
       Lutz Jaenicke
       BTU Cottbus
       Allgemeine Elektrotechnik
       Universitaetsplatz 3-4
       D-03044 Cottbus, Germany



								       SMTP(8)
=11910
+179
(19)