    SMTP-SINK(1)                                                      SMTP-SINK(1)

    NAME
           smtp-sink - multi-threaded SMTP/LMTP test server

    SYNOPSIS
           smtp-sink [options] [inet:][host]:port backlog

           smtp-sink [options] unix:pathname backlog

    DESCRIPTION
           smtp-sink listens on the named host (or address) and port.
           It takes SMTP messages from the network  and  throws  them
           away.   The  purpose is to measure client performance, not
           protocol compliance.

           smtp-sink may also be  configured  to  capture  each  mail
           delivery  transaction  to  file.  Since disk latencies are
           large compared to network delays, this mode  of  operation
           can  reduce  the  maximal performance by several orders of
           magnitude.

           Connections can be accepted on IPv4 or IPv6 endpoints,  or
           on  UNIX-domain  sockets.   IPv4 and IPv6 are the default.
           This program is the complement of the smtp-source(1)  pro-
           gram.

           Note:  this  is an unsupported test program. No attempt is
           made to maintain  compatibility  between  successive  ver-
           sions.

           Arguments:

           -4     Support  IPv4  only. This option has no effect when
                  Postfix is built without IPv6 support.

           -6     Support IPv6 only. This  option  is  not  available
                  when Postfix is built without IPv6 support.

           -8     Do not announce 8BITMIME support.

           -a     Do not announce SASL authentication support.

           -A delay
                  Wait  delay  seconds after responding to DATA, then
                  abort prematurely with a 550 reply status.  Do  not
                  read  further  input  from  the  client; this is an
                  attempt to block the client before  it  sends  ".".
                  Specify a zero delay value to abort immediately.

           -c     Display  running counters that are updated whenever
                  an SMTP session ends, a QUIT command  is  executed,
                  or when "." is received.

           -C     Disable XCLIENT support.

           -d dump-template
                  Dump each mail transaction to a single-message file
                  whose name is created by  expanding  the  dump-tem-
                  plate via strftime(3) and appending a pseudo-random
                  hexadecimal number (example: "%Y%m%d%H/%M." expands
                  into  "2006081203/05.809a62e3").   If  the template
                  contains "/" characters,  missing  directories  are
                  created  automatically.  The message dump format is
                  described below.

                  Note: this option keeps one capture file  open  for
                  every mail transaction in progress.

           -D dump-template
                  Append  mail  transactions  to a multi-message dump
                  file whose name is created by expanding  the  dump-
                  template via strftime(3).  If the template contains
                  "/" characters,  missing  directories  are  created
                  automatically.    The   message   dump   format  is
                  described below.

                  Note: this option keeps one capture file  open  for
                  every mail transaction in progress.

           -e     Do not announce ESMTP support.

           -E     Do not announce ENHANCEDSTATUSCODES support.

           -f command,command,...
                  Reject  the  specified  commands  with a hard (5xx)
                  error code.  This option implies -p.

                  Examples of commands are CONNECT, HELO, EHLO, LHLO,
                  MAIL,  RCPT,  VRFY,  DATA, ., RSET, NOOP, and QUIT.
                  Separate command names by white  space  or  commas,
                  and  use  quotes  to  protect  white space from the
                  shell. Command names are case-insensitive.

           -F     Disable XFORWARD support.

           -h hostname
                  Use hostname in the  SMTP  greeting,  in  the  HELO
                  response,  and  in  the  EHLO response. The default
                  hostname is "smtp-sink".

           -L     Enable LMTP instead of SMTP.

           -m count (default: 256)
                  An upper bound on the maximal number of  simultane-
                  ous  connections  that  smtp-sink will handle. This
                  prevents the  process  from  running  out  of  file
                  descriptors. Excess connections will stay queued in
                  the TCP/IP stack.

           -M count
                  Terminate after receiving count messages.

           -n count
                  Terminate after count sessions.

           -p     Do not announce support for ESMTP command  pipelin-
                  ing.

           -P     Change  the  server  greeting so that it appears to
                  come through a CISCO PIX system. Implies -e.

           -q command,command,...
                  Disconnect (without replying) after  receiving  one
                  of the specified commands.

                  Examples of commands are CONNECT, HELO, EHLO, LHLO,
                  MAIL, RCPT, VRFY, DATA, ., RSET,  NOOP,  and  QUIT.
                  Separate  command  names  by white space or commas,
                  and use quotes to  protect  white  space  from  the
                  shell. Command names are case-insensitive.

           -Q command,command,...
                  Send a 421 reply and disconnect after receiving one
                  of the specified commands.

                  Examples of commands are CONNECT, HELO, EHLO, LHLO,
                  MAIL,  RCPT,  VRFY,  DATA, ., RSET, NOOP, and QUIT.
                  Separate command names by white  space  or  commas,
                  and  use  quotes  to  protect  white space from the
                  shell. Command names are case-insensitive.

           -r command,command,...
                  Reject the specified commands  with  a  soft  (4xx)
                  error code.  This option implies -p.

                  Examples of commands are CONNECT, HELO, EHLO, LHLO,
                  MAIL, RCPT, VRFY, DATA, ., RSET,  NOOP,  and  QUIT.
                  Separate  command  names  by white space or commas,
                  and use quotes to  protect  white  space  from  the
                  shell. Command names are case-insensitive.

           -R root-directory
                  Change  the process root directory to the specified
                  location.  This option requires  super-user  privi-
                  leges. See also the -u option.

           -s command,command,...
                  Log the named commands to syslogd.

                  Examples of commands are CONNECT, HELO, EHLO, LHLO,
                  MAIL, RCPT, VRFY, DATA, ., RSET,  NOOP,  and  QUIT.
                  Separate  command  names  by white space or commas,
                  and use quotes to  protect  white  space  from  the
                  shell. Command names are case-insensitive.

           -S start-string
                  An  optional  string that is prepended to each mes-
                  sage that is written to a dump file (see  the  dump
                  file  format  description  below).  The following C
                  escape  sequences  are  supported:  \a  (bell),  \b
                  (backslace),  \f (formfeed), \n (newline), \r (car-
                  riage return), \t (horizontal  tab),  \v  (vertical
                  tab),  \ddd  (up to three octal digits) and \\ (the
                  backslash character).

           -t timeout (default: 100)
                  Limit the time for receiving a command or sending a
                  response.   The time limit is specified in seconds.

           -T windowsize
                  Override the  default  TCP  window  size.  To  work
                  around  broken  TCP window scaling implementations,
                  specify a value > 0 and < 65536.

           -u username
                  Switch to the specified user privileges after open-
                  ing  the network socket and optionally changing the
                  process root directory.  This  option  is  required
                  when  the  process runs with super-user privileges.
                  See also the -R option.

           -v     Show the SMTP conversations.

           -w delay
                  Wait delay seconds before responding to a DATA com-
                  mand.

           -W command:delay[:odds]
                  Wait  delay  seconds  before responding to command.
                  If odds is also specified (a  number  between  1-99
                  inclusive),  wait  for  a random multiple of delay.
                  The random multiplier is equal  to  the  number  of
                  times the program needs to roll a dice with a range
                  of 0..99 inclusive,  before  the  dice  produces  a
                  result greater than or equal to odds.

           [inet:][host]:port
                  Listen  on  network  interface  host  (default: any
                  interface) TCP port port. Both host and port may be
                  specified in numeric or symbolic form.

           unix:pathname
                  Listen on the UNIX-domain socket at pathname.

           backlog
                  The  maximum  length  the  queue of pending connec-
                  tions, as defined by the listen(2) system call.

    DUMP FILE FORMAT
           Each dumped message contains a  sequence  of  text  lines,
           terminated  with  the  newline  character. The sequence of
           information is as follows:

           o      The optional string specified with the -S option.

           o      The  smtp-sink  generated  headers  as   documented
                  below.

           o      The  message  header  and body as received from the
                  SMTP client.

           o      An empty line.

           The format of the smtp-sink generated headers is  as  fol-
           lows:

           X-Client-Addr: text
                  The client IP address without enclosing []. An IPv6
                  address is prefixed with "ipv6:".  This  record  is
                  always present.

           X-Client-Proto: text
                  The  client  protocol:  SMTP,  ESMTP  or LMTP. This
                  record is always present.

           X-Helo-Args: text
                  The arguments of the  last  HELO  or  EHLO  command
                  before  this mail delivery transaction. This record
                  is present only if the client sent  a  recognizable
                  HELO or EHLO command before the DATA command.

           X-Mail-Args: text
                  The arguments of the MAIL command that started this
                  mail delivery transaction. This record  is  present
                  exactly once.

           X-Rcpt-Args: text
                  The  arguments  of an RCPT command within this mail
                  delivery transaction. There is one record for  each
                  RCPT  command, and they are in the order as sent by
                  the client.

           Received: text
                  A message header for compatibility with  mail  pro-
                  cessing  software. This three-line header marks the
                  end of the headers provided by  smtp-sink,  and  is
                  formatted as follows:

                  from helo ([addr])
                         The HELO or EHLO command argument and client
                         IP address.  If the client did not send HELO
                         or  EHLO,  the  client  IP  address  is used
                         instead.

                  by host (smtp-sink) with proto id random;
                         The hostname specified with the  -h  option,
                         the   client  protocol  (see  X-Client-Proto
                         above), and the pseudo-random portion of the
                         per-message capture file name.

                  time-stamp
                         A time stamp as defined in RFC 2822.

    SEE ALSO
           smtp-source(1), SMTP/LMTP message generator

    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

                                                                      SMTP-SINK(1)