Hi
well, not everyone sends out spam solicitations to unsuspecting receivers.
so, for some, it's not how they do business.
there are a lot of domainers who wait for offers,
while their names are listed on various marketplaces , their own sites or both, than you might think.
personally I don't like to give such advice, simply because the quality of the domains being solicited and whom the receivers are, are unknown.
and who wants to enable a spammer?
just saying....
I see that it's not popular issue to be anyway proactive, by sending properly formed emails to target client. Oh, well..