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RLYTEST(1)            User Contributed Perl Documentation           RLYTEST(1)


NAME

       rlytest - test mail host for third-party relay


SYNOPSIS

       rlytest [-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 ALSO

       mail(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)

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