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http://www.exim.org/bugzilla/show_bug.cgi?id=459





------- Comment #3 from [EMAIL PROTECTED]  2007-02-01 10:14 -------
On Thu, 1 Feb 2007, [EMAIL PROTECTED] wrote:

> ------- Comment #2 from [EMAIL PROTECTED]  2007-02-01 10:06 -------
> On Thursday 01 February 2007 10:34, [EMAIL PROTECTED] wrote:
> > What should this key contain for a hosts condition?
> 
> :-P
> 
> Why, the hostname of course. 

So, if somebody says

   hosts = 192.168.1.1

which works quite happily now, you want Exim to try to look up a 
hostname before processing that list? Is that right? That is highly
incompatible because it is resource-wasteful and there is the defer 
problem.

> You'd have to use e.g. net-mysql to make the IP 
> address be the key, in a manner similar to single-key lookups.

The string expansion happens *before* the list is scanned, and therefore 
*before* Exim knows what kind of items there are in the list.

> But the big problem is that the query string is in many cases expanded before 
> it's passed to match_isinlist() or match_address_list(). That would have to 
> change.

Massively incompatible change.

I know this is an awkward area, but it has "grown up" that way, and to 
disturb it now would, I believe, cause hassle because it would almost 
certainly affect existing installations. Therefore, I think any change 
of this magnitude must be an "Exim 5" issue. 

Philip

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