Hi, among our userbase are a couple of thousand people that forward their mail to other domains (mostly freemails). This has the obvious and well-known downside that any spam going to this user looks like it originated in our network, which might lead to some reputation problems. And of course the nasty bounce/double-bounce issues...
I wonder if there is any checklist how to deal with this situation best? Something along the lines of - put forwards on a dedicated server - if you see too many fatal errors for a destination address, disable forwarding - try to block as much spam as possible before forwarding (in our case that would mean RBL and pre-queue filters, as we are not allowed to drop mail we successfully received) Any other recommendations? Is SRS/PRVS helpful here? How do you deal with that? Bernhard
