[Exim] Multi-A dnslists

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Author: Chris Edwards
Date:  
To: exim-users
Subject: [Exim] Multi-A dnslists
Some composite DNSBLs e.g. sorbs (www.sorbs.net) return multiple A records
where an IP is guilty of multiple offences. This is different from
the bitmask response used by RBL+, blitzed and others.

Can anyone help me clarify exim's behaviour in the multi-A case ?
I assume that:

dnslists = bl.example.org=xxx

is true if any of the A records returned equals xxx. But what about:

dnslists = bl.example.org!=xxx

Is this true only if *no* A record equals xxx ?? Or is it true as long as
there exists some A record not equal to xxx" ??

I'm not sure this is clear from the spec or newstuff file. Perhaps I'm
missing something.

--
Chris Edwards, Glasgow University Computing Service