We are near the end of a e-mail system consolidation project. About 25 independant e-mail systems into one Exchange 2007 environment. I am in the process of cleaning up our SMTP traffic from all those systems and domains. With all of the e-mail address changes to the new single domain we do have a high amount of bounces due to bad addresses. I recently implimented LDAP acceptance queries on inbound e-mail for our new domain. My question is, is there a good way to do something like LDAP acceptance queries for outbound e-mail? All of our legacy e-mail systems use our IronPort infrastructure as their smarthost. So, a lot of e-mail that is still being generated by our old systems (hard to kill those things gracefully) is being accepted into IronPort on a private listener but is actually sent to a bad address so it just needs to be bounced back. Rather than accept that mail on IronPort I would like to do sometype of LDAP acceptance query but see that on Private Listeners Accept Queries are not available. Any suggestions?