Turns out the underlying library wants IPv6 addresses colon separated;
but in contexts where a host address is being tested for list
membership, exim passes it to the lookup as dot-separated. This is of
course documented in the Spec, section 10.12.
Since IP addresses are the only things worth testing by this lookup,
maybe I should internally translate them from dot to colon, before I
pass them to libcork?
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which rewrite From, fetch the TXT record for no-use.mooo.com.
