Steve,
The only way to prevent entry into the ORBS database is to restrict relay to
your local network, either by IP address or by blocking the port, or to
perform some sort of authentication such as SMTP AUTH or POP before SMTP.
Do not think for one minute that your mail server is secure because it
checks the validity of the account specified in the RCPTTO command. Most
relay checkers, including those used by ORBS, check for this vulnerability.
Benjamin S. Rogers
Web Developer, c4.net
voice: (508) 240-0051
fax: (508) 240-0057
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