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auth-relaytest - attempt to use authenticated SMTP to relay to a DSBL-compliant host


auth-relaytest [-tv] ntlm <ip address[:port]>
auth-relaytest [-tv] (cram-md5|login) <username> <password> <ip address[:port]>


auth-relaytest attempts to connect to the specified <ip address> on the specified port
(default is port 25) and tries to use the supplied authentication data to relay mail
through the host.

auth-relaytest uses the sender_user, sender_domain, target_user, target_domain, and auth-
message parameters from dsbl.conf(5) by default. If the auth-message parameter is not
present, the message parameter is used instead.

In the first mode of operation shown, auth-relaytest attempts to authenticate using
anonymous NTLM authentication. A well-known bug in certain Microsoft SMTP server
implementations (described at
http://www.microsoft.com/technet/security/bulletin/MS02-011.asp) will allow relaying for
any client that authenticates in this way.

In the second form of operation, auth-relaytest attempts to authenticate using either the
cram-md5 or login variant of SMTP AUTH, using the supplied username and password.


-t Test mode. Instead of using the target_domain parameter from dsbl.conf(5), the
test_target_domain parameter is used instead. This is useful for sending a test
message to yourself, perhaps to check that the server is actually relaying the

-v Verbose mode. Details of the SMTP transaction are written to standard output.


Paul Howarth <[email protected]>
Ian Gulliver <[email protected]>

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