It appears that Support 3Hound via mailop <[email protected]> said:
>We must follow their instruction present in the agreement:  verify the 
>correctness of the data AND NOT contact the end user.

That is simply impossible. For reasons many other people have explained, there
is no way to verify an address other than to send it a message and ask the
recipient to confirm it.

To emphasize a point other people have made, even if there were some other way
to verify that an address exists, which there is not, you do not know whether
that address actually belongs to the putative end user, and in many cases it
will not.

Perhaps it will help to say, they probably ask for a postal address, too.
How can you be sure that the address you have is the end user's actual
address?  Many post offices have a service to verify that the address
exists, but they can't tell you who lives there.

Who signed this agreement?  They put you in an impossible position from
which I see no escape that doesn't involve a lot of money.

R's,
John

PS: You would not believe how many people wrongly believe that my Gmail address
is their address. For example, I get mail nearly every day for a guy who owns a
drugstore in Paris.
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