Querying other SMTP server for valid addresses?

[Garry Glendown]

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Hi,

I'm running MS for several domains, some of which are receiving
tremendous amounts of spam for non-existent mail addresses. As the
domain itself is handled on another MX, I do not have (and probably
never will) a list of valid recipients - is there a way to set something
up that will do an MTA check upon receiving a message whether the
recipient does exist, and then accept (or deny) the message on MTA level?

Tnx, -gg

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