I have been using an SMTP event sink to catch outbound emails. Based on the Message-id i have been comparing that to items stored in the exchange store. The problem is that if someone is using Cached Exchange mode, then the message-id is generated on their local machine and when it is synced with exchange the exchange store keeps stores this message-id. When the sink fires (or you follow the message using exchange message tracker) there is a new message-id that is genereated by exchange. Is anyone aware of either a way to grab the original message-id from the fired sink, or change the behaviour of exchange storing the local message-id? Thanks! Earle