On Mon, 9 Jul 2007, 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.
Presumably you have some kind of white listing? Otherwise, Exim as a sender will behave like this: 1. Try first IP 2. Temporary error - remember this 3. Try next IP 4. Accepted - message delivered 5. New message arrives 6. First IP hasn't reached its retry time yet 7. Try second IP Will that be accepted? If so, that's fine for a server sending from a single IP. What about a server that sends from different IPs (because it's implementing a number of virtual servers) but has a single set of retry data? In the above scenario, the second message could then be from a different IP. (There are servers that do this - facilities were added to Exim not very long ago to make it easy to do this.) -- Philip Hazel University of Cambridge Computing Service Get the Exim 4 book: http://www.uit.co.uk/exim-book -- ## 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/
