smtp-source - 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 LMTP. Connections can be made to
UNIX-domain and IPv4 or IPv6 servers. IPv4 and IPv6 are
Note: this is an unsupported test program. No attempt is
made to maintain compatibility between successive ver-
-4 Connect to the server with IPv4. This option has no
effect when Postfix is built without IPv6 support.
-6 Connect to the server with IPv6. This option is not
available when Postfix is built without IPv6 sup-
-c Display a running counter that is incremented each
time an SMTP DATA command completes.
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.
-d Don't disconnect after sending a message; send the
next message over the same connection.
Use the specified sender address (default:
Send length bytes as message payload. The length
does not include message headers.
-L Speak LMTP rather than SMTP.
Send the specified number of messages (default: 1).
Use the specified hostname or [address] in the HELO
command and in the default sender and recipient
addresses, instead of the machine hostname.
-N 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
-o Old mode: don't send HELO, and don't send message
Send the specified number of recipients per trans-
action (default: 1). Recipient names are generated
by prepending a number to the recipient address.
Run the specified number of SMTP sessions in paral-
lel (default: 1).
Send mail with the named subject line (default:
-t to Use the specified recipient address (default:
Wait for a random period of time 0 <= n <= interval
between messages. Suspending one thread does not
affect other delivery threads.
-v Make the program more verbose, for debugging pur-
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
IBM T.J. Watson Research
P.O. Box 704
Yorktown Heights, NY 10598, USA