Let me delete that WIKI page ... as it is horrendously out of date.
Use this instead
http://openbd.org/manual/?/plugin_cfsmtp
OnMailFrom(email,ip) / OnMailTo( email, ip ) .... return false to not
accept that email.
An SMTP MTA agent will typically send you ONE OnMailFrom() but multiple
OnMailTo() for the same email exchange. Returning false on
OnMailFrom() will kill the connection if there is only one email.
Returning false for OnMailTo() will only nuke the connection _IF_ you
returned false for all the emails in that exchange.
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official tag/function reference: http://openbd.org/manual/
mailing list - http://groups.google.com/group/openbd?hl=en
