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Transferring Incoming Email From POP3 to Exchange

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?
Servername.organization.org?
localhost.organization.org?

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!

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gdf99
Asked:
gdf99
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1 Solution
 
SembeeCommented:
You can use anything you like for the hostname as the MX record.

I have used post.domain.com, mailhost.domain.com, office.domain.com, london.domain.com etc
Whatever you set it to, you will use the same name in the MX records.

Otherwise all you need is port 25 open and the correct port forwarding.
Do make sure that you have a reverse DNS and SMTP banner correct.
http://www.amset.info/exchange/dnsconfig.asp

Simon.
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gdf99Author Commented:
Thanks for the speedy response.

I guess I'm wondering how the hosting companies computers will know to pass the mail to my exchange server if I don't put the Exchange server's IP address anywhere.  Do I also have to put an entry in the Windows 2003 DNS?

Why do I need port forwarding?

Thanks!
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SembeeCommented:
Your internal DNS plays no part in the delivery of email.
For email to be delivered to your Exchange server directly you only need four things.

1. An external IP address.
2. Port 25 opened on your firewall to allow SMTP traffic to get to your Exchange server. If you are NATting the external IP address then you need to configure port forwarding to your internal IP address. I would be very surprised if you were using public IP addresses internally.
3. A host name pointing at your external IP address.
4. An MX record listing the host name created above.

Remember that an MX record cannot be an IP address.
The DNS changes need to be made by whoever looks after your domain name on the internet. This could be your domain name registrar, web host or ISP.

Simon.
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gdf99Author Commented:
Thanks, Simon!  Worked great!  
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