Hi all.
We currently have an exchange server which we are not using, our email is hosted by Interland. We are going to switch web/email hosting companies but we would like to also use our Exchange Server to use the shared calendar/tasks/contact features as well as Outlook Web Access.
Could we use our Exchange Server to pull from our Email/web host and our users in turn connect to Exchange.
POP Email Host --> Our Exchange Server --> Our users
Thanks in advance.
For example, the most effective way of dealing with spam is to not allow it to be delivered at all. That means rejecting it at the point of delivery. If you have the messages delivered to another host first, then you must accept those messages from the host and then attempt to deal with them.
Furthermore you can reject a lot of messages by configuring recipient filtering. This basically rejects messages for users who do not exist on your server. I have sites that drop 10,000 messages a day that are sent to unknown users.
SMTP delivery is how Exchange was designed to work and is how Exchange works best. You do have to take some care when configuring it, but I wouldn't recommend the POP3 collection method that you have outlined in your original question.
As for a name, probably the closest is SMTP delivery. What it involves is getting your MX records switched to point to your external IP address. Exchange then becomes responsible for email for your domain. You continue collecting email from the old POP3 accounts for at least another 48 hours (because that is how long DNS changes take to propagate) I usually go for another 24 hours on top, then you use Exchange exclusively for all email.
Simon.