Yesterday I mentioned the possibility of having postscreen listen
on both primary and backup MX address *on the same machine*.
> In addition, one can also introduce new mechanisms into postscreen.
> For example, disabling dynamic whitelisting for connections to
> backup MX addresses.
I have run this for a day now, and in my case about 10% of all the
spambots will connect to the backup MX address. Of this 10%, 1/5
talks to the primary MX address, and 1/3 is not a pregreeter.
So, the result is not as spectacular as the pregreet test, but it
can still help to block some spambots before they are blacklisted.
Now I need to push out some code, so that Ralf can collect statistics
with larger email volumes than my single-user machine.
Wietse
