[Exim] local-part testing

Hi,

I am not subscribed to this list but I got an important question:

We are looking for an exim mechanism to test, if a local part of an
email address at a remote host is valid or not.

For example: A user gives us his emailaddress kdjfiueirui87@???. How
can we find out if this is a valid local user of AOL or not without
sending him a testmail?

Please reply to uk@??? for any hints.

Thanx A LOT in advance,

regards,

Uli
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