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SpamAssassin by Alistair McDonald

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Open Relay Tests

There are a number of automated open relay tests available. Alternately, we can also manually perform the test for an open relay.

Automated Open Relay Testers

There are several automated open relay testers. We need to use a telnet session to access and use their services. The best-known relay tester is relay-test.mail-abuse.org.

To use this service, we enter the following command at the command prompt of the mail server we are testing:

telnet relay-test.mail-abuse.org

An example session follows:

$ telnet relay-test.mail-abuse.org Trying 168.61.4.13... Connected to cygnus.mail-abuse.org. Escape character is '^]'. Connecting to 999.888.777.666 ... <<< 220 domain.com ESMTP My_MTA >>> HELO cygnus.mail-abuse.org <<< 250 domain.com :Relay ...

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