Perhaps you could use http://www.qmail.org/qqrbl

Then users who don't want spam can filter based on the X-RBL: header.

> I want to convert one more sendmail MX to qmail with rblsmtpd.
> 
> But there is a show stopper: A handful of users demand to
> receive all email, even when it comes from blacklisted IPs.

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