Hi Everyone. I am wondering if anyone can give me some assistance. We are in the process of transferring our email service to a co-hosted service. We have set up the following on our exchange server: http://support.microsoft.com/kb/321721/en-us Which makes our internal exchange server forward all mail for unknown mailboxes to a different server. However, once I set up and address on the co-hosted server, when we send a mail to a user who is currently on our exchange server, the co-hosted server just gives a reply to say that the user does not exist. I can see the reason for this, it is because that server is not trying to either forward mail back to our server, or is not automatically trying to send the email via the internet (in which case it would come back in via our exchange server). To get around this problem, I have tried setting the outgoing mailbox on the user who is on the co-hosted server, to use our internal server for sending mail. This does not work. It does not seem to get to the user, is this because the user does not have an account on the internal server? Does anyone know what I need to change in order to make sure either the co-hosted exchange server sends mail to our server or our outgoing mail server allows an unknown user to send mail through it (perhaps if it is on the same subnet?) The co-hosted server is external to our organisation and is not a member of our domain. Both servers are to host the same Domain name while we are migrating. Any help very much appreciated. Thanks Freddy
