I am cross posting to the Exchange list as well. I have and Exchange server (2003) that is basically underused. (Internal mail only and some calendaring.) I have a third party hosting my external mail (MailAnyone.net).
I have been given the green light to research bringing all mail in house onto the Exchange 2003 server. I have a Windows 2003 Active Directory domain. I have an ASA firewall and an Ironport for email. I think to host I would need to do several of these things but I am not sure and I am not sure of the order. -Globally change the smtp addresses for all users that already have external accounts in Exchange to match. -Add an mx record to point to an outward facing address such as 206.18.123.215 -Add a dns record for mail.imcu.com or pop.imcu.com and smtp.imcu.com? -Add a route through the firewall to the ironport and a relay to the exchange box. (incoming) -Add a smtp route from exchange to the ironport and relay to the internet. (outgoing) -Import all Outlook Express mail into Exchange and the delete all mail from the outlook express clients and remove the mailboxes from there. -Add a spf record to the 206.18.123.215. I know I am missing a lot and I need to verify that the mail that was going to the mailanyone and still be retrieved until we are sure all the mailboxes and distribution lists are working??? Sidenote my OWA stopped working a while back. Nobody used it but me but if we go to this I will need to have it up and running. Where do I look to find out why it has stopped.