auth-relaytest(1) 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 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.


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


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