I am in the process of setting up a new Ex2007 enviornment to replace our Ex2003 envirnoment. I have 1 Hub Transport/CAS server and 2 mailbolx servers, with SCR setup between them.
When I try send email from a mailbox on the Ex2007 mailbox server, the emails wait in the Outbox and are never delivered. If cached exchange mode is on they appear to be sent, as the email goes into 'Sent items' but again it is never delivered.
This issue occurs if email is external or internal or even on the same Exchange server. It would appear for some reason the Ex2007 server is not accepting messages from the client, as there is no evidence of the email in either the mailbox server nor hub transport servers tracking logs.
Any help greatly appreciated.