[exim] Re: query-style lookup for text files

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.

Must you index by name not IP?

- Jeremy