RLYTEST(1) User Contributed Perl Documentation RLYTEST(1)NAMErlytest - test mail host for third-party relay
SYNOPSISrlytest [-f sender_addr] [-u recip_addr] [-c comment] [-t timeout]
target_host
DESCRIPTION
The rlytest utility performs a test on target_host to determine whether
it will relay third-party email. It will try to relay an email message
to yourself through that host. A host that allows third-party relay is
subject to attack by Internet vandals, and frequently is hijacked by
spammers to relay massive amounts of junk email. A host that allows
third-party relay should be immediately secured, disconnected, or
shunned as a menace to the Internet.
The following options are available:
-f sender_addr
Specifies the ("MAIL FROM") email address to use on the probe. By
default, rlytest tries to calculate an email address in the target
domain. This is to ensure that the host is not using simple (and
easily defeated) envelope checks for anti-relay protection.
-u recip_addr
Specifies the ("RCPT TO") email address to use on the probe. By
default, rlytest tries to calculate your email address and use
that. A host that is susceptible to relay will deliver a probe
message to this address.
-c comment
Embed comment in the body of the test message. This may be useful,
for instance, if you are doing some automatic testing and want to
insert cookies into the messages.
-t timeout
Sets the timeout value (default is 60 seconds) for certain
operations.
If the remote host refused to relay the message, the program will
terminate with a zero exit status dislay a message to stderr similar
to:
rlytest: relay rejected - status code 571
If the message was accepted, the program will terminate with an exit
status of 2 and display a message to stderr similar to:
rlytest: relay accepted - status code 221
Any other (non-zero) exit status indicates a program error, such as a
bad hostname or host not resopnding.
EXAMPLE
Here is an example, showing a host that refuses third-party relay:
$ ./rlytest mail.example.dom
Connecting to mail.example.dom ...
<<< 220 mail.example.dom ready
>>> HELO garcon.unicom.com
<<< 250 Hello garcon.unicom.com, pleased to meet you
>>> MAIL FROM:<nobody@mail.example.dom>
<<< 250 <chip@garcon.unicom.com>... Sender ok
>>> RCPT TO:<chip@garcon.unicom.com>
<<< 550 <chip@garcon.unicom.com>... Relaying Denied
rlytest: relay rejected - status code 550
BUGS
There is no reliable and portable method to determine the local host's
fully qualified domain name. If the utility bombs out complaining
about FQDN problems, read the "host name configuration" information
near the top of the script.
SEE ALSOmail(1), sendmail(8), smtpd(8)AUTHOR
Chip Rosenthal
Unicom Systems Development
<chip@unicom.com>
$Id: rlytest,v 1.22 2001/10/22 22:02:48 chip Exp $
See http://www.unicom.com/sw/#rlytest for latest version.
perl v5.20.3 2015-10-07 RLYTEST(1)
