I have some questions about transferring incoming email from a hosted POP3 server to an Internal Exchange server. I was not on hand for the intitial configuration and now have to make some changes.
Currently, this organization has their website and email hosted by a outside communications company. The outside company is responsible for Incoming mail only. The organization has an Exchange server with mailboxes configured with a third party POP3 connector (IGETMAIL) to pull mail from the hosted POP3 accounts into the Exchange server mailboxes. The Exchange server is responsible for outgoing mail.
The organization now wants to host incoming mail as well as outgoing. My questions are about making this happen.
I've seen a number of posts about migrating from POP3 to Exchange, but I still have some questions.
I am able to make changes to the DNS zone configuration. Currently the hosting company has an A record configured with a public IP address (68.X.X.X) to the mail.organization.org. There is no MX record configured. If I need to create the MX record and I can't use an IP address, what hostname would I use?
We host the firewal, so what changes would need to be made on the firewall, beside opening port 25. A NAT for the 68.X.X.X to the private Exchange server IP address?
Did I miss anything?
Thanks in advance!