I have been told that we have to start sending out notifications to those return addresses who have been blocked because of a blacklist. (I don't want to do this but...)
Have you told "them" what that entails?
Specifically, if you assume that the blacklist is 100% accurate (which it should be), then 100% of your spam will be transferred from you to some other innocent victim.
In other words, if all blacklists were 100% accurate, and 100% of all mailservers used them to block spam, *nobody* would ever see any spam.
On the other hand, if all blacklists were 100% accurate, and 100% of all mailservers used them to BOUNCE spam, everyone would receive the same amount of spam.
It's one of those nasty situations where it seems cool if you're one of the first to do it, but once critical mass is reached, it backfires for everyone (just like those pyramid schemes). The only people that do either (bouncing or pyramid schemes) are typically either those that are ignorant or those that are unethical. Fortunately, it's not you that falls into that category (but whoever told you to does!).
I'll let others comment on whether or not your suggested rule would work (I've done very little with IMail rules).
-Scott
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