SMTP-SINK(1) General Commands Manual 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) program.
Note: this is an unsupported test program. No attempt is made to maintain compatibility between successive
versions.
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 ".". Spec‐
ify a zero delay value to abort immediately.
-b soft-bounce-reply
Use soft-bounce-reply for soft reject responses. The default reply is "450 4.3.0 Error: command
failed".
-B hard-bounce-reply
Use hard-bounce-reply for hard reject responses. The default reply is "500 5.3.0 Error: command
failed".
-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 cre‐
ated automatically. The message dump format is described below.
-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 simultaneous connections that smtp-sink will handle. This pre‐
vents 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 pipelining.
-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‐
\f (formfeed), \n (newline), \r (carriage 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 opening 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 command.
-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 connections, 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:
· The optional string specified with the -S option.
· The smtp-sink generated headers as documented below.
· The message header and body as received from the SMTP client.
· An empty line.
The format of the smtp-sink generated headers is as follows:
X-Client-Addr: text
The client IP address without enclosing []. An IPv6 address is prefixed with "ipv6:". This record is
always present.
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 processing 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)
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