Guys... Can any one send me some links to understand better about Exchange categorizer and event sink?? We have an Exchange 2003 server & a non exchange server. I want to reroute all email from a particular group of internal users through another (non-Exchange) server which will pre-process their email before it's sent to its final recipient. Is it possible to create a Categorizer event sink to look up the group membership of the sender and if they belong to a particular group it should be rerouted through the another Non-Exchange server?? Is this the correct way to do this to meet the requirement? Plz correct me if I am wrong and let me know the other possibilities. Moreover, I would like to know, if it is possible to meet this requirement using SMTP connector? if so how would it work using restrictions on SMTP connectors? It looks like you can only reject/accept mail. If one connector rejects an email does Exchange then tries another connector or does the email sending just fails? Your help is highly appreciated... Thanks in advance Mahadevan Confidentiality Statement: This message is intended only for the individual or entity to which it is addressed. It may contain privileged, confidential information which is exempt from disclosure under applicable laws. If you are not the intended recipient, please note that you are strictly prohibited from disseminating or distributing this information (other than to the intended recipient) or copying this information. If you have received this communication in error, please notify us immediately by return email.