Wietse, Thx for the reply
> The policy server can reject mail from a remote network with a > local sender address. > > Isn't that what you want? > > As an added bonus, it can also reject mail from a local network > with a remote sender address. This can help to stop outbound spam > from zombie-infested PCs. Yes exactly. I read into the page again and it seems to be suitable for my purpose. Unfortunately it also seems to mean I have to write my own policy server.. At least I have a starting point from now on. Thanks a lot for the help! Regards, Serge Fonville -- http://www.sergefonville.nl Convince Google!! They need to support Adsense over SSL https://www.google.com/adsense/support/bin/answer.py?hl=en&answer=10528 http://www.google.com/support/forum/p/AdSense/thread?tid=1884bc9310d9f923&hl=en