Re: [Exim] Planning for Exim 4

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Autor: Philip Hazel
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A: Jeffrey Goldberg
CC: exim-users
Assumpte: Re: [Exim] Planning for Exim 4
On Thu, 4 Jan 2001, Jeffrey Goldberg wrote:

> (!X or Y) and (!Z or W)
>
> I don't think that that can be done with ACLs, but I don't have a proof.
> (actually the more I think about it, the more I think it CAN be done with
> ACLs. But I'm not sure how.)


Like this:

deny X : !Y
accept !Z
accept W

Essentially, the existence of "deny" allows you to have a "vertical
AND", if you see what I mean. It's like Exim's lists:

local_domains = a : b : c

can be read as "a or b or c", but

local_domains = !a : b : c

is "not a and (b or c)". The negative changes the implicit conjunction.

-- 
Philip Hazel            University of Cambridge Computing Service,
ph10@???      Cambridge, England. Phone: +44 1223 334714.