Re: [exim] Detecting the domain part of a host address

< snip some very good stuff that saved me writing something similar>
>
> You need a lookup table populated from elsewhere. IMO you
> cannot do this
> with a regular expression, no matter how hard you ask.
>
The only thing I can think of that might help would be to investigate WHOIS, but
even that suggestion is flawed because not every TLD runs WHOIS. This is not a
simple problem.
John