smtp-source - Cheap VPS LLC


Section: User Commands (1)
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multi-threaded SMTP/LMTP test generator


smtp-source [options] [inet:]host[:port]

smtp-source [options] unix:pathname


smtp-source connects to the named host and TCP port
(default: port 25)
and sends one or more messages to it, either sequentially
or in parallel. The program speaks either SMTP (default) or
Connections can be made to UNIX-domain and IPv4 or IPv6 servers.
IPv4 and IPv6 are the default.

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



Connect to the server with IPv4. This option has no effect when
Postfix is built without IPv6 support.

Connect to the server with IPv6. This option is not available when
Postfix is built without IPv6 support.

Don’t abort when the server sends something other than the
expected positive reply code.

Display a running counter that is incremented each time
an SMTP DATA command completes.
-C count

When a host sends RESET instead of SYN|ACK, try count times
before giving up. The default count is 1. Specify a larger count in
order to work around a problem with TCP/IP stacks that send RESET
when the listen queue is full.

Don’t disconnect after sending a message; send the next
message over the same connection.
-f from

Use the specified sender address (default: <[email protected]>).
-F file

Send the pre-formatted message header and body in the
specified file, while prepending ‘.’ before lines that
begin with ‘.’, and while appending CRLF after each line.
-l length

Send length bytes as message payload. The length does not
include message headers.

Speak LMTP rather than SMTP.
-m message_count

Send the specified number of messages (default: 1).
-M myhostname

Use the specified hostname or [address] in the HELO command
and in the default sender and recipient addresses, instead
of the machine hostname.

Prepend a non-repeating sequence number to each recipient
address. This avoids the artificial 100% hit rate in the
resolve and rewrite client caches and exercises the
trivial-rewrite daemon, better approximating Postfix
performance under real-life work-loads.

Old mode: don’t send HELO, and don’t send message headers.
-r recipient_count

Send the specified number of recipients per transaction (default: 1).
Recipient names are generated by prepending a number to the
recipient address.
-R interval

Wait for a random period of time 0 <= n <= interval between messages.
Suspending one thread does not affect other delivery threads.
-s session_count

Run the specified number of SMTP sessions in parallel (default: 1).
-S subject

Send mail with the named subject line (default: none).
-t to

Use the specified recipient address (default: <[email protected]>).
-T windowsize

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

Make the program more verbose, for debugging purposes.
-w interval

Wait a fixed time between messages.
Suspending one thread does not affect other delivery threads.

Connect via TCP to host host, port port. The default
port is smtp.

Connect to the UNIX-domain socket at pathname.



No SMTP command pipelining support.


smtp-sink(1), SMTP/LMTP message dump


The Secure Mailer license must be distributed with this software.


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










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