RBL checks when some mail is received via a relay

Tim Cappell tc at sommersoft.de
Thu Aug 4 13:31:53 IST 2011

We have a Mailscanner setup where some of the mails (from an older domain) are received by a relay (which is not blacklisted). Mailscanner works fine for all the mails we receive directly but RBL checks do not apply to those mails sent via the relay (which is still about 50%). Thus there are a lot of spam mails that get through although the originating mail server is blacklisted.
Is there a way to apply a method similar to "Read IP Address From Received Header" _only_ to mails where the last hop is that specific relay server?

Best regards,

Tim Cappell
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