SMTPD(8)                                                 SMTPD(8)

NAME
       smtpd - Postfix SMTP server

SYNOPSIS
       smtpd [generic Postfix daemon options]

DESCRIPTION
       The  SMTP  server  accepts network connection requests and
       performs zero or more SMTP  transactions  per  connection.
       Each received message is piped through the cleanup(8) dae-
       mon, and is placed into the incoming queue as  one  single
       queue  file.   For  this  mode  of  operation, the program
       expects to be run from the master(8) process manager.

       Alternatively, the SMTP server takes an  established  con-
       nection  on  standard input and deposits messages directly
       into the maildrop queue.  In  this  so-called  stand-alone
       mode,  the SMTP server can accept mail even while the mail
       system is not running.

       The SMTP server implements a variety of policies for  con-
       nection  requests, and for parameters given to HELO, ETRN,
       MAIL FROM, VRFY and RCPT TO commands.  They  are  detailed
       below and in the main.cf configuration file.

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

STANDARDS
       RFC 821 (SMTP protocol)
       RFC 1123 (Host requirements)
       RFC 1652 (8bit-MIME transport)
       RFC 1869 (SMTP service extensions)
       RFC 1870 (Message Size Declaration)
       RFC 1985 (ETRN command)
       RFC 2554 (AUTH command)
       RFC 2821 (SMTP protocol)
       RFC 2920 (SMTP Pipelining)

DIAGNOSTICS
       Problems and transactions are logged to syslogd(8).

       Depending  on the setting of the notify_classes parameter,
       the postmaster is notified of bounces, protocol  problems,
       policy violations, and of other trouble.

CONFIGURATION PARAMETERS
       Changes   to  main.cf  are  picked  up  automatically,  as
       smtpd(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
       The following parameters work around implementation errors
       in  other software, and/or allow you to override standards
       in order to prevent undesirable use.

       broken_sasl_auth_clients (no)
              Enable inter-operability  with  SMTP  clients  that
              implement  an  obsolete version of the AUTH command
              (RFC 2554).

       disable_vrfy_command (no)
              Disable the SMTP VRFY command.

       smtpd_noop_commands (empty)
              List of  commands  that  the  Postfix  SMTP  server
              replies  to with "250 Ok", without doing any syntax
              checks and without changing state.

       strict_rfc821_envelopes (no)
              Require that addresses received in SMTP  MAIL  FROM
              and RCPT TO commands are enclosed with <>, and that
              those addresses do not contain RFC 822  style  com-
              ments or phrases.

       Available in Postfix version 2.1 and later:

       resolve_null_domain (no)
              Resolve an address that ends in the "@" null domain
              as if the local hostname were specified, instead of
              rejecting the address as invalid.

       smtpd_reject_unlisted_sender (no)
              Request  that  the Postfix SMTP server rejects mail
              from  unknown  sender  addresses,  even   when   no
              explicit  reject_unlisted_sender access restriction
              is specified.

       smtpd_sasl_exceptions_networks (empty)
              What SMTP clients Postfix will not offer AUTH  sup-
              port to.

ADDRESS REWRITING CONTROLS
       See  the  ADDRESS_REWRITING_README document for a detailed
       discussion of Postfix address rewriting.

       receive_override_options (empty)
              Enable or disable  recipient  validation,  built-in
              content filtering, or address mapping.

       Available in Postfix version 2.2 and later:

       local_header_rewrite_clients (see 'postconf -d' output)
              Append the domain name in $myorigin or $mydomain to
              message header addresses from these  clients  only;
              either  don't  rewrite  message  headers from other
              clients at all, or append the domain specified with
              the remote_header_rewrite_domain parameter.

AFTER QUEUE EXTERNAL CONTENT INSPECTION CONTROLS
       As  of  version 1.0, Postfix can be configured to send new
       mail to an external  content  filter  AFTER  the  mail  is
       queued.  This  content  filter  is expected to inject mail
       back into a (Postfix or other) MTA for  further  delivery.
       See the FILTER_README document for details.

       content_filter (empty)
              The  name of a mail delivery transport that filters
              mail after it is queued.

BEFORE QUEUE EXTERNAL CONTENT INSPECTION CONTROLS
       As of version 2.1, the Postfix SMTP server can be  config-
       ured  to send incoming mail to a real-time SMTP-based con-
       tent filter BEFORE mail is queued.  This content filter is
       expected  to  inject  mail  back  into  Postfix.   See the
       SMTPD_PROXY_README document for details on how to  config-
       ure and operate this feature.

       smtpd_proxy_filter (empty)
              The  hostname  and  TCP  port of the mail filtering
              proxy server.

       smtpd_proxy_ehlo ($myhostname)
              How the Postfix SMTP server announces itself to the
              proxy filter.

       smtpd_proxy_timeout (100s)
              The time limit for connecting to a proxy filter and
              for sending or receiving information.

GENERAL CONTENT INSPECTION CONTROLS
       The following parameters are applicable for both  built-in
       and external content filters.

       Available in Postfix version 2.1 and later:

       receive_override_options (empty)
              Enable  or  disable  recipient validation, built-in
              content filtering, or address mapping.

EXTERNAL CONTENT INSPECTION CONTROLS
       The following parameters are applicable for  both  before-
       queue and after-queue content filtering.

       Available in Postfix version 2.1 and later:

       smtpd_authorized_xforward_hosts (empty)
              What  SMTP  clients are allowed to use the XFORWARD
              feature.

SASL AUTHENTICATION CONTROLS
       Postfix SASL support (RFC 2554) can be used  to  authenti-
       cate  remote  SMTP clients to the Postfix SMTP server, and
       to authenticate the Postfix SMTP client to a  remote  SMTP
       server.  See the SASL_README document for details.

       broken_sasl_auth_clients (no)
              Enable  inter-operability  with  SMTP  clients that
              implement an obsolete version of the  AUTH  command
              (RFC 2554).

       smtpd_sasl_auth_enable (no)
              Enable  SASL  authentication  in  the  Postfix SMTP
              server.

       smtpd_sasl_application_name (smtpd)
              The application name used for SASL server  initial-
              ization.

       smtpd_sasl_local_domain (empty)
              The name of the local SASL authentication realm.

       smtpd_sasl_security_options (noanonymous)
              Restrict what authentication mechanisms the Postfix
              SMTP server will offer to the client.

       smtpd_sender_login_maps (empty)
              Optional lookup table with  the  SASL  login  names
              that own sender (MAIL FROM) addresses.

       Available in Postfix version 2.1 and later:

       smtpd_sasl_exceptions_networks (empty)
              What  SMTP clients Postfix will not offer AUTH sup-
              port to.

VERP SUPPORT CONTROLS
       With VERP style delivery,  each  recipient  of  a  message
       receives a customized copy of the message with his/her own
       recipient address encoded in the envelope sender  address.
       The VERP_README file describes configuration and operation
       details of Postfix support for  variable  envelope  return
       path addresses.  VERP style delivery is requested with the
       SMTP XVERP command or with the "sendmail -V"  command-line
       option  and is available in Postfix version 1.1 and later.

       default_verp_delimiters (+=)
              The two default VERP delimiter characters.

       verp_delimiter_filter (-=+)
              The characters Postfix accepts  as  VERP  delimiter
              characters  on the Postfix sendmail(1) command line
              and in SMTP commands.

       Available in Postfix version 1.1 and 2.0:

       authorized_verp_clients ($mynetworks)
              What SMTP clients are allowed to specify the  XVERP
              command.

       Available in Postfix version 2.1 and later:

       smtpd_authorized_verp_clients ($authorized_verp_clients)
              What  SMTP clients are allowed to specify the XVERP
              command.

TROUBLE SHOOTING CONTROLS
       The DEBUG_README document describes how to debug parts  of
       the  Postfix mail system. The methods vary from making the
       software log a lot of detail, to running some daemon  pro-
       cesses under control of a call tracer or debugger.

       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 protocol errors.

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

       soft_bounce (no)
              Safety net to keep mail queued that would otherwise
              be returned to the sender.

       Available in Postfix version 2.1 and later:

       smtpd_authorized_xclient_hosts (empty)
              What SMTP clients are allowed to  use  the  XCLIENT
              feature.

KNOWN VERSUS UNKNOWN RECIPIENT CONTROLS
       As  of  Postfix  version 2.0, the SMTP server rejects mail
       for unknown recipients. This prevents the mail queue  from
       clogging  up  with  undeliverable  MAILER-DAEMON messages.
       Additional  information  on   this   topic   is   in   the
       LOCAL_RECIPIENT_README and ADDRESS_CLASS_README documents.

       show_user_unknown_table_name (yes)
              Display the name of  the  recipient  table  in  the
              "User unknown" responses.

       canonical_maps (empty)
              Optional  address mapping lookup tables for message
              headers and envelopes.

       recipient_canonical_maps (empty)
              Optional address mapping lookup tables for envelope
              and header recipient addresses.

       Parameters concerning known/unknown local recipients:

       mydestination  ($myhostname,  localhost.$mydomain,  local-
       host)
              The  list  of  domains  that  are delivered via the
              $local_transport mail delivery transport.

       inet_interfaces (all)
              The network interface addresses that this mail sys-
              tem receives mail on.

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

       local_recipient_maps             (proxy:unix:passwd.byname
       $alias_maps)
              Lookup  tables with all names or addresses of local
              recipients: a recipient address is local  when  its
              domain  matches $mydestination, $inet_interfaces or
              $proxy_interfaces.

       unknown_local_recipient_reject_code (550)
              The numerical Postfix  SMTP  server  response  code
              when    a   recipient   address   is   local,   and
              $local_recipient_maps specifies a  list  of  lookup
              tables that does not match the recipient.

       Parameters  concerning  known/unknown  recipients of relay
       destinations:

       relay_domains ($mydestination)
              What destination domains (and  subdomains  thereof)
              this system will relay mail to.

       relay_recipient_maps (empty)
              Optional  lookup tables with all valid addresses in
              the domains that match $relay_domains.

       unknown_relay_recipient_reject_code (550)
              The numerical Postfix SMTP server reply code when a
              recipient   address   matches  $relay_domains,  and
              relay_recipient_maps specifies  a  list  of  lookup
              tables that does not match the recipient address.

       Parameters  concerning known/unknown recipients in virtual
       alias domains:

       virtual_alias_domains ($virtual_alias_maps)
              Postfix is final destination for the specified list
              of  virtual  alias  domains,  that  is, domains for
              which all addresses are  aliased  to  addresses  in
              other local or remote domains.

       virtual_alias_maps ($virtual_maps)
              Optional  lookup  tables  that  alias specific mail
              addresses or  domains  to  other  local  or  remote
              address.

       unknown_virtual_alias_reject_code (550)
              The SMTP server reply code when a recipient address
              matches    $virtual_alias_domains,    and     $vir-
              tual_alias_maps  specifies  a list of lookup tables
              that does not match the recipient address.

       Parameters concerning known/unknown recipients in  virtual
       mailbox domains:

       virtual_mailbox_domains ($virtual_mailbox_maps)
              Postfix is final destination for the specified list
              of  domains;  mail  is  delivered  via  the   $vir-
              tual_transport mail delivery transport.

       virtual_mailbox_maps (empty)
              Optional  lookup tables with all valid addresses in
              the domains that match $virtual_mailbox_domains.

       unknown_virtual_mailbox_reject_code (550)
              The SMTP server reply code when a recipient address
              matches    $virtual_mailbox_domains,    and   $vir-
              tual_mailbox_maps specifies a list of lookup tables
              that does not match the recipient address.

RESOURCE AND RATE CONTROLS
       The  following parameters limit resource usage by the SMTP
       server and/or control client request rates.

       line_length_limit (2048)
              Upon input, long lines are chopped up  into  pieces
              of  at  most this length; upon delivery, long lines
              are reconstructed.

       queue_minfree (0)
              The minimal amount of free space in  bytes  in  the
              queue file system that is needed to receive mail.

       message_size_limit (10240000)
              The  maximal  size in bytes of a message, including
              envelope information.

       smtpd_recipient_limit (1000)
              The maximal number of recipients that  the  Postfix
              SMTP server accepts per message delivery request.

       smtpd_timeout (300s)
              The  time  limit  for sending a Postfix SMTP server
              response and for receiving  a  remote  SMTP  client
              request.

       smtpd_history_flush_threshold (100)
              The  maximal  number  of  lines in the Postfix SMTP
              server command history before it  is  flushed  upon
              receipt of EHLO, RSET, or end of DATA.

       The per SMTP client connection count and request rate lim-
       its are implemented in co-operation with the anvil(8) ser-
       vice,  and are available in Postfix version 2.2 and later.

       smtpd_client_connection_count_limit (50)
              How many simultaneous  connections  any  client  is
              allowed to make to this service.

       smtpd_client_connection_rate_limit (0)
              The  maximal  number  of  connection  attempts  any
              client is allowed to make to this service per  time
              unit.

       smtpd_client_message_rate_limit (0)
              The  maximal  number  of  message delivery requests
              that any client is allowed to make to this  service
              per time unit, regardless of whether or not Postfix
              actually accepts those messages.

       smtpd_client_recipient_rate_limit (0)
              The maximal number of recipient addresses that  any
              client  is allowed to send to this service per time
              unit, regardless of whether or not Postfix actually
              accepts those recipients.

       smtpd_client_event_limit_exceptions ($mynetworks)
              Clients  that  are  excluded from connection count,
              connection rate, message  rate  or  recipient  rate
              restrictions.

TARPIT CONTROLS
       When  a  remote SMTP client makes errors, the Postfix SMTP
       server can insert delays before responding. This can  help
       to  slow  down  run-away  software.   The behavior is con-
       trolled by an error counter  that  counts  the  number  of
       errors  within an SMTP session that a client makes without
       delivering mail.

       smtpd_error_sleep_time (1s)
              With  Postfix  2.1  and  later:  the  SMTP   server
              response  delay  after  a client has made more than
              $smtpd_soft_error_limit  errors,  and  fewer   than
              $smtpd_hard_error_limit  errors, without delivering
              mail.

       smtpd_soft_error_limit (10)
              The number  of  errors  a  remote  SMTP  client  is
              allowed  to make without delivering mail before the
              Postfix SMTP server slows down all its responses.

       smtpd_hard_error_limit (20)
              The maximal number of errors a remote  SMTP  client
              is allowed to make without delivering mail.

       smtpd_junk_command_limit (100)
              The  number  of  junk commands (NOOP, VRFY, ETRN or
              RSET) that a remote SMTP client can send before the
              Postfix  SMTP  server starts to increment the error
              counter with each junk command.

       Available in Postfix version 2.1 and later:

       smtpd_recipient_overshoot_limit (1000)
              The number of recipients that a remote SMTP  client
              can  send  in  excess  of  the limit specified with
              $smtpd_recipient_limit,  before  the  Postfix  SMTP
              server  increments  the per-session error count for
              each excess recipient.

ACCESS POLICY DELEGATION CONTROLS
       As of version 2.1, Postfix can be configured  to  delegate
       access  policy  decisions  to an external server that runs
       outside Postfix.  See  the  file  SMTPD_POLICY_README  for
       more information.

       smtpd_policy_service_max_idle (300s)
              The  time  after which an idle SMTPD policy service
              connection is closed.

       smtpd_policy_service_max_ttl (1000s)
              The time after which an active SMTPD policy service
              connection is closed.

       smtpd_policy_service_timeout (100s)
              The  time  limit  for  connecting to, writing to or
              receiving from a delegated SMTPD policy server.

ACCESS CONTROLS
       The SMTPD_ACCESS_README document gives an introduction  to
       all the SMTP server access control features.

       smtpd_delay_reject (yes)
              Wait  until  the  RCPT TO command before evaluating
              $smtpd_client_restrictions,    $smtpd_helo_restric-
              tions and $smtpd_sender_restrictions, or wait until
              the     ETRN     command     before      evaluating
              $smtpd_client_restrictions and $smtpd_helo_restric-
              tions.

       parent_domain_matches_subdomains (see 'postconf  -d'  out-
       put)
              What   Postfix   features   match   subdomains   of
              "domain.tld" automatically, instead of requiring an
              explicit ".domain.tld" pattern.

       smtpd_client_restrictions (empty)
              Optional SMTP server  access  restrictions  in  the
              context of a client SMTP connection request.

       smtpd_helo_required (no)
              Require that a remote SMTP client introduces itself
              at the beginning of an SMTP session with  the  HELO
              or EHLO command.

       smtpd_helo_restrictions (empty)
              Optional  restrictions that the Postfix SMTP server
              applies in the context of the SMTP HELO command.

       smtpd_sender_restrictions (empty)
              Optional restrictions that the Postfix SMTP  server
              applies in the context of the MAIL FROM command.

       smtpd_recipient_restrictions           (permit_mynetworks,
       reject_unauth_destination)
              The  access  restrictions  that  the  Postfix  SMTP
              server applies in the context of the RCPT  TO  com-
              mand.

       smtpd_etrn_restrictions (empty)
              Optional  SMTP  server  access  restrictions in the
              context of a client ETRN request.

       allow_untrusted_routing (no)
              Forward   mail   with   sender-specified    routing
              (user[@%!]remote[@%!]site)  from  untrusted clients
              to destinations matching $relay_domains.

       smtpd_restriction_classes (empty)
              User-defined aliases for groups of access  restric-
              tions.

       smtpd_null_access_lookup_key (<>)
              The  lookup key to be used in SMTP access(5) tables
              instead of the null sender address.

       permit_mx_backup_networks (empty)
              Restrict  the  use  of  the  permit_mx_backup  SMTP
              access  feature  to  only  domains whose primary MX
              hosts match the listed networks.

       Available in Postfix version 2.0 and later:

       smtpd_data_restrictions (empty)
              Optional access restrictions that the Postfix  SMTP
              server applies in the context of the SMTP DATA com-
              mand.

       smtpd_expansion_filter (see 'postconf -d' output)
              What characters are allowed in $name expansions  of
              RBL reply templates.

       Available in Postfix version 2.1 and later:

       smtpd_reject_unlisted_sender (no)
              Request  that  the Postfix SMTP server rejects mail
              from  unknown  sender  addresses,  even   when   no
              explicit  reject_unlisted_sender access restriction
              is specified.

       smtpd_reject_unlisted_recipient (yes)
              Request that the Postfix SMTP server  rejects  mail
              for  unknown  recipient  addresses,  even  when  no
              explicit reject_unlisted_recipient access  restric-
              tion is specified.

SENDER AND RECIPIENT ADDRESS VERIFICATION CONTROLS
       Postfix   version  2.1  introduces  sender  and  recipient
       address verification.   This  feature  is  implemented  by
       sending  probe email messages that are not actually deliv-
       ered.  This feature is requested  via  the  reject_unveri-
       fied_sender    and    reject_unverified_recipient   access
       restrictions.  The status of verification probes is  main-
       tained by the verify(8) server.  See the file ADDRESS_VER-
       IFICATION_README for information about  how  to  configure
       and operate the Postfix sender/recipient address verifica-
       tion service.

       address_verify_poll_count (3)
              How many times to query the verify(8)  service  for
              the  completion  of an address verification request
              in progress.

       address_verify_poll_delay (3s)
              The delay between queries for the completion of  an
              address verification request in progress.

       address_verify_sender (postmaster)
              The  sender  address to use in address verification
              probes.

       unverified_sender_reject_code (450)
              The numerical Postfix  SMTP  server  response  code
              when   a  recipient  address  is  rejected  by  the
              reject_unverified_sender restriction.

       unverified_recipient_reject_code (450)
              The numerical Postfix SMTP server response  when  a
              recipient address is rejected by the reject_unveri-
              fied_recipient restriction.

ACCESS CONTROL RESPONSES
       The following  parameters  control  numerical  SMTP  reply
       codes and/or text responses.

       access_map_reject_code (554)
              The  numerical  Postfix  SMTP  server response code
              when a client  is  rejected  by  an  access(5)  map
              restriction.

       defer_code (450)
              The  numerical  Postfix  SMTP  server response code
              when a remote SMTP client request  is  rejected  by
              the "defer" restriction.

       invalid_hostname_reject_code (501)
              The  numerical  Postfix  SMTP  server response code
              when the client HELO or EHLO command  parameter  is
              rejected  by  the  reject_invalid_hostname restric-
              tion.

       maps_rbl_reject_code (554)
              The numerical Postfix  SMTP  server  response  code
              when a remote SMTP client request is blocked by the
              reject_rbl_client,             reject_rhsbl_client,
              reject_rhsbl_sender    or    reject_rhsbl_recipient
              restriction.

       non_fqdn_reject_code (504)
              The numerical Postfix SMTP server reply code when a
              client     request     is     rejected    by    the
              reject_non_fqdn_hostname, reject_non_fqdn_sender or
              reject_non_fqdn_recipient restriction.

       reject_code (554)
              The  numerical  Postfix  SMTP  server response code
              when a remote SMTP client request  is  rejected  by
              the "reject" restriction.

       relay_domains_reject_code (554)
              The  numerical  Postfix  SMTP  server response code
              when  a  client  request   is   rejected   by   the
              reject_unauth_destination recipient restriction.

       unknown_address_reject_code (450)
              The  numerical  Postfix  SMTP  server response code
              when a sender or recipient address is  rejected  by
              the         reject_unknown_sender_domain         or
              reject_unknown_recipient_domain restriction.

       unknown_client_reject_code (450)
              The numerical Postfix  SMTP  server  response  code
              when  a  client without valid address <=> name map-
              ping  is  rejected  by  the   reject_unknown_client
              restriction.

       unknown_hostname_reject_code (450)
              The  numerical  Postfix  SMTP  server response code
              when the hostname specified with the HELO  or  EHLO
              command  is rejected by the reject_unknown_hostname
              restriction.

       Available in Postfix version 2.0 and later:

       default_rbl_reply (see 'postconf -d' output)
              The default SMTP server  response  template  for  a
              request  that  is rejected by an RBL-based restric-
              tion.

       multi_recipient_bounce_reject_code (550)
              The numerical Postfix  SMTP  server  response  code
              when a remote SMTP client request is blocked by the
              reject_multi_recipient_bounce restriction.

       rbl_reply_maps (empty)
              Optional lookup tables with RBL response templates.

MISCELLANEOUS CONTROLS
       config_directory (see 'postconf -d' output)
              The  default  location  of  the Postfix main.cf and
              master.cf configuration 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.

       command_directory (see 'postconf -d' output)
              The location of  all  postfix  administrative  com-
              mands.

       double_bounce_sender (double-bounce)
              The sender address of postmaster notifications that
              are generated by the mail system.

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

       mail_name (Postfix)
              The mail system name that is displayed in Received:
              headers,  in  the  SMTP  greeting  banner,  and  in
              bounced mail.

       mail_owner (postfix)
              The UNIX system account that owns the Postfix queue
              and most Postfix daemon processes.

       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 daemon process terminates.

       myhostname (see 'postconf -d' output)
              The internet hostname of this mail system.

       mynetworks (see 'postconf -d' output)
              The  list  of "trusted" SMTP clients that have more
              privileges than "strangers".

       myorigin ($myhostname)
              The domain name that locally-posted mail appears to
              come  from,  and that locally posted mail is deliv-
              ered to.

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

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

       queue_directory (see 'postconf -d' output)
              The location of the Postfix top-level queue  direc-
              tory.

       recipient_delimiter (empty)
              The separator between user names and address exten-
              sions (user+foo).

       smtpd_banner ($myhostname ESMTP $mail_name)
              The text that follows the 220 status  code  in  the
              SMTP greeting banner.

       syslog_facility (mail)
              The syslog facility of Postfix logging.

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

SEE ALSO
       anvil(8), client count and request rate management
       cleanup(8), message canonicalization
       trivial-rewrite(8), address resolver
       verify(8), address verification service
       postconf(5), configuration parameters
       master(8), process manager
       syslogd(8), system logging

README FILES
       ADDRESS_CLASS_README, blocking unknown hosted or relay recipients
       ADDRESS_REWRITING_README Postfix address manipulation
       FILTER_README, external after-queue content filter
       LOCAL_RECIPIENT_README, blocking unknown local recipients
       SMTPD_ACCESS_README, built-in access policies
       SMTPD_POLICY_README, external policy server
       SMTPD_PROXY_README, external before-queue content filter
       SASL_README, Postfix SASL howto
       VERP_README, Postfix XVERP extension
       XCLIENT_README, Postfix XCLIENT extension
       XFORWARD_README, Postfix XFORWARD extension

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

                                                         SMTPD(8)