On 2026/01/13 3:18 PM, Chris Siebenmann via Exim-users wrote:
Currently, the documentation says this about negated bitwise-and
conditions:
Negation can also be used with a bitwise-and restriction. The
dnslists condition with only be trus if a result is returned by
the lookup which, anded with the restriction, is all zeroes. For
example:
As I read it, the documentation appears to be saying that a '!&'
bitwise-and works as:
(ip & bitmask) == 0
If I'm reading right, you're thinking that "the restriction" in the docs text
is identical to the supplied bitmask.
I think it instead means "the bitmask as adjusted by the negation".
We could write something like
"anded with the inverted bitmask"
or even
"The dnslists condition will only be true if, after clearing the bits in the
result indicated by the mask, the result is all zeroes."
Would you find that more clear?
Happy to hear comments from anyone else, too.
--
Cheers,
Jeremy
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