Marc Perkel wrote: > The idea behind this is that it requires the server be touched twice in > the proper order to get in. Spam bots try once and not in the proper > order. That's how the filter works.
This is, effectively, an implementation of port knocking, a security practice I have yet to be convinced is worth the effort. I'm wondering how your implementation will deal with perfectly legitimate email coming from the many many SMTP sending engines that don't follow the standards. -- Martin A. Brooks | http://www.antibodymx.net/ | Anti-spam & anti-virus Consultant | [EMAIL PROTECTED] | filtering. Inoculate antibodymx.net | m: +447896578023 | your mail system. -- ## List details at http://www.exim.org/mailman/listinfo/exim-users ## Exim details at http://www.exim.org/ ## Please use the Wiki with this list - http://www.exim.org/eximwiki/
