On Tue, 13 Sep 2005 12:45:29 +0100, Jeremy Harris <jgh@???>
wrote:
>Marc Haber wrote:
>> which will return (modulo bracketing and other syntax errors) the
>> second field of any line (the first line?) in /etc/exim4/passwd.client
>> for whose first field exists an A record pointing to the IP address of
>> the we are actually talking to.
>
>I suspect you'd find that to be too many A-lookups to be doing,
>even with a local DNS cache.
Bear in mind that we are looking for a smarthost here, so it is only
one host name per exim, which will at most have ~10 A records for a
_very_ big ISP, and these A records would be cached pretty fast. I
suspect that a passwd.client file with more than 20 entries would be
_extraordinary_ exotic. Additionally, I sincerely hope that exim
caches auth credentials once obtained.
Greetings
Marc
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