No incoming mail to Exchange 2003
Posted on 2008-10-24
First let me point out I've recently been thrust into a Sys Admin role without much experience, and have had no experience of Exchange Server until now.
We've recently started the migration from exchange Exchange 5.5 to Exchange 2003 (on W2K3). The installation of 2003 itself went without a hitch. While we've been moving mailboxes from 5.5 to 2003 all incoming mail has still been port forwarded from our Watchguard Firebox to the 5.5 server.
I now want to start removing the 5.5 server completely but first want to forward the incoming mail towards the 2003 server. I've tried changing port forwarding at the firewall so that it points at the 2003 server. I've also tried changing the 2003's IP address to that of the 5.5 server (of course changing the 5.5 IP to something else) so that the port forwarding now points at the 2003 server (I've also added an SMTP connector on the 2003 server). The problem is in each situation, there is no incoming mail within 5-10 minutes of making the change. I then rollback to the original setup and all is okay again. Am I being too hasty in not letting network sort itself out? If so, how long should this normally take? Or have I missed something fairly fundamental for allowing inbound mail to Exchange 2003? Outbound mail has no problems.
All replies will be much appreciated.