Quoting Blu ([EMAIL PROTECTED]): > If my relay server (not open, but relay for customers) has no means to > verify recipients, what to do when the destination server rejects that > mail already accepted by my server?. Bounce.
(Implicit assumption that you have no option but to accept forged-sender spam noted without further comment.) Well, you will increasingly find your MTA put on a "teergrube this chump" list, if it keeps doing that. I'm not telling you what to do; I'm just predicting what's going to happen. In your shoes, out of self-interest, I'd work at making my system behave like that as little as possible.