On 03/26/2015 08:43 AM, David F. Skoll wrote: > On Thu, 26 Mar 2015 12:09:58 +0100 > Reindl Harald <h.rei...@thelounge.net> wrote: > >> why in the world would a reject *before queue* trigger a backscatter >> or bounce on my side? > > How do you do before-queue rejection of a message that is... > > 1) Directed to multiple recipients... > > 2) Some of which have different spam thresholds or have even opted-out? > > Solve that problem, and then I agree with you. And saying "well, don't > let different end-users have different settings" is not a solution. > Neither is "tempfail all recipients but the first so the message > is transmitted one time for each recipient." >
If one of your customer domains has non-default settings, give them their own IP address and a separate MX record pointing to that address. Then if a multi-recipient message is addressed to someone in that domain, the sending MTA will split the message before sending it (because it's headed to a different server, as far as the MTA knows). Your pre-queue filter can then switch settings depending on the IP address, and should satisfy your criteria above. Obviously it's a little annoying to set up an MX for every such domain, but you can charge a little PITA fee for domains that want special treatment.
