Querying other SMTP server for valid addresses?

[Spicer, Kevin (MBLEA it)]

It rather depends what MTA you are running and what the destination MX
is (i.e. what MTA software), but as general advice milter-ahead is one
option, or if the final destination is a windows domain theres an FAQ
that describes how to use the LDAP routing feature of sendmail (without
actually using LDAP!) to achieve the same thing

-----Original Message-----
From: Garry Glendown [mailto:garry at GLENDOWN.DE] 
Sent: 19 November 2004 14:26
To: MAILSCANNER at JISCMAIL.AC.UK
Subject: Querying other SMTP server for valid addresses?

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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